1421620881 has 4 divisors (see below), whose sum is σ = 1895494512. Its totient is φ = 947747252.

The previous prime is 1421620853. The next prime is 1421620883. The reversal of 1421620881 is 1880261241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1880261241 = 3 ⋅626753747.

It is a cyclic number.

It is not a de Polignac number, because 1421620881 - 2⁶ = 1421620817 is a prime.

It is a super-2 number, since 2×1421620881² = 4042011858590432322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1421620883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236936811 + ... + 236936816.

It is an arithmetic number, because the mean of its divisors is an integer number (473873628).

Almost surely, 2^1421620881 is an apocalyptic number.

It is an amenable number.

1421620881 is a deficient number, since it is larger than the sum of its proper divisors (473873631).

1421620881 is an equidigital number, since it uses as much as digits as its factorization.

1421620881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473873630.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1421620881 is about 37704.3880867997. The cubic root of 1421620881 is about 1124.4183675910.

The spelling of 1421620881 in words is "one billion, four hundred twenty-one million, six hundred twenty thousand, eight hundred eighty-one".