111528538797421 has 2 divisors, whose sum is σ = 111528538797422. Its totient is φ = 111528538797420.

The previous prime is 111528538797413. The next prime is 111528538797437. The reversal of 111528538797421 is 124797835825111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75916456130025 + 35612082667396 = 8713005^2 + 5967586^2 .

It is a cyclic number.

It is not a de Polignac number, because 111528538797421 - 2³ = 111528538797413 is a prime.

It is a super-2 number, since 2×111528538797421² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111528538797461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55764269398710 + 55764269398711.

It is an arithmetic number, because the mean of its divisors is an integer number (55764269398711).

Almost surely, 2^{111528538797421} is an apocalyptic number.

It is an amenable number.

111528538797421 is a deficient number, since it is larger than the sum of its proper divisors (1).

111528538797421 is an equidigital number, since it uses as much as digits as its factorization.

111528538797421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33868800, while the sum is 64.

The spelling of 111528538797421 in words is "one hundred eleven trillion, five hundred twenty-eight billion, five hundred thirty-eight million, seven hundred ninety-seven thousand, four hundred twenty-one".