1421200163881 has 3 divisors (see below), whose sum is σ = 1421201356023. Its totient is φ = 1421198971740.

The previous prime is 1421200163861. The next prime is 1421200163891. The reversal of 1421200163881 is 1883610021241.

The square root of 1421200163881 is 1192141.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1060263555481 + 360936608400 = 1029691^2 + 600780^2 .

It is not a de Polignac number, because 1421200163881 - 2¹⁷ = 1421200032809 is a prime.

It is a super-2 number, since 2×1421200163881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421200163881.

It is not an unprimeable number, because it can be changed into a prime (1421200163861) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 596071 + ... + 1788211.

It is an arithmetic number, because the mean of its divisors is an integer number (473733785341).

Almost surely, 2^{1421200163881} is an apocalyptic number.

1421200163881 is the 1192141-st square number.

1421200163881 is the 596071-st centered octagonal number.

It is an amenable number.

1421200163881 is a deficient number, since it is larger than the sum of its proper divisors (1192142).

1421200163881 is an frugal number, since it uses more digits than its factorization.

1421200163881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384282 (or 1192141 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

It can be divided in two parts, 1421200 and 163881, that added together give a square (1585081 = 1259²).

The spelling of 1421200163881 in words is "one trillion, four hundred twenty-one billion, two hundred million, one hundred sixty-three thousand, eight hundred eighty-one".