111579120421 has 2 divisors, whose sum is σ = 111579120422. Its totient is φ = 111579120420.

The previous prime is 111579120383. The next prime is 111579120427. The reversal of 111579120421 is 124021975111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107856412225 + 3722708196 = 328415^2 + 61014^2 .

It is a cyclic number.

It is not a de Polignac number, because 111579120421 - 2³³ = 102989185829 is a prime.

It is a super-2 number, since 2×111579120421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111579120427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55789560210 + 55789560211.

It is an arithmetic number, because the mean of its divisors is an integer number (55789560211).

Almost surely, 2^111579120421 is an apocalyptic number.

It is an amenable number.

111579120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

111579120421 is an equidigital number, since it uses as much as digits as its factorization.

111579120421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 34.

The spelling of 111579120421 in words is "one hundred eleven billion, five hundred seventy-nine million, one hundred twenty thousand, four hundred twenty-one".