113863693921 has 4 divisors (see below), whose sum is σ = 116941091092. Its totient is φ = 110786296752.

The previous prime is 113863693897. The next prime is 113863693939. The reversal of 113863693921 is 129396368311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43447233600 + 70416460321 = 208440^2 + 265361^2 .

It is a cyclic number.

It is not a de Polignac number, because 113863693921 - 2⁹ = 113863693409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113863693991) 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, 1538698530 + ... + 1538698603.

It is an arithmetic number, because the mean of its divisors is an integer number (29235272773).

Almost surely, 2^113863693921 is an apocalyptic number.

It is an amenable number.

113863693921 is a deficient number, since it is larger than the sum of its proper divisors (3077397171).

113863693921 is an equidigital number, since it uses as much as digits as its factorization.

113863693921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077397170.

The product of its digits is 1259712, while the sum is 52.

The spelling of 113863693921 in words is "one hundred thirteen billion, eight hundred sixty-three million, six hundred ninety-three thousand, nine hundred twenty-one".