1421123867881 has 3 divisors (see below), whose sum is σ = 1421125059991. Its totient is φ = 1421122675772.

The previous prime is 1421123867861. The next prime is 1421123867899. The reversal of 1421123867881 is 1887683211241.

The square root of 1421123867881 is 1192109.

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., 1351036600281 + 70087267600 = 1162341^2 + 264740^2 .

It is not a de Polignac number, because 1421123867881 - 2³³ = 1412533933289 is a prime.

It is a super-2 number, since 2×1421123867881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421123867861) 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, 596055 + ... + 1788163.

Almost surely, 2^{1421123867881} is an apocalyptic number.

1421123867881 is the 1192109-th square number.

1421123867881 is the 596055-th centered octagonal number.

It is an amenable number.

1421123867881 is a deficient number, since it is larger than the sum of its proper divisors (1192110).

1421123867881 is an frugal number, since it uses more digits than its factorization.

1421123867881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384218 (or 1192109 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The spelling of 1421123867881 in words is "one trillion, four hundred twenty-one billion, one hundred twenty-three million, eight hundred sixty-seven thousand, eight hundred eighty-one".