111520542421 has 4 divisors (see below), whose sum is σ = 111649767552. Its totient is φ = 111391317292.

The previous prime is 111520542401. The next prime is 111520542431. The reversal of 111520542421 is 124245025111.

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.

It is a cyclic number.

It is not a de Polignac number, because 111520542421 - 2⁷ = 111520542293 is a prime.

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 111520542421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111520542401) 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, 64611271 + ... + 64612996.

It is an arithmetic number, because the mean of its divisors is an integer number (27912441888).

Almost surely, 2^111520542421 is an apocalyptic number.

It is an amenable number.

111520542421 is a deficient number, since it is larger than the sum of its proper divisors (129225131).

111520542421 is an equidigital number, since it uses as much as digits as its factorization.

111520542421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129225130.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 111520542421 its reverse (124245025111), we get a palindrome (235765567532).

The spelling of 111520542421 in words is "one hundred eleven billion, five hundred twenty million, five hundred forty-two thousand, four hundred twenty-one".