111657525421 has 4 divisors (see below), whose sum is σ = 120246565852. Its totient is φ = 103068484992.

The previous prime is 111657525407. The next prime is 111657525433. The reversal of 111657525421 is 124525756111.

It is a happy number.

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 59085455625 + 52572069796 = 243075^2 + 229286^2 .

It is a cyclic number.

It is not a de Polignac number, because 111657525421 - 2⁵ = 111657525389 is a prime.

It is a super-2 number, since 2×111657525421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111657525451) 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, 4294520196 + ... + 4294520221.

It is an arithmetic number, because the mean of its divisors is an integer number (30061641463).

Almost surely, 2^111657525421 is an apocalyptic number.

It is an amenable number.

111657525421 is a deficient number, since it is larger than the sum of its proper divisors (8589040431).

111657525421 is an equidigital number, since it uses as much as digits as its factorization.

111657525421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8589040430.

The product of its digits is 84000, while the sum is 40.

The spelling of 111657525421 in words is "one hundred eleven billion, six hundred fifty-seven million, five hundred twenty-five thousand, four hundred twenty-one".