111534152021 has 4 divisors (see below), whose sum is σ = 111679190700. Its totient is φ = 111389113344.

The previous prime is 111534151997. The next prime is 111534152033. The reversal of 111534152021 is 120251435111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120251435111 = 25799 ⋅4661089.

It can be written as a sum of positive squares in 2 ways, for example, as 42968729521 + 68565422500 = 207289^2 + 261850^2 .

It is a cyclic number.

It is not a de Polignac number, because 111534152021 - 2³⁰ = 110460410197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111534152921) 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, 72518186 + ... + 72519723.

It is an arithmetic number, because the mean of its divisors is an integer number (27919797675).

Almost surely, 2^111534152021 is an apocalyptic number.

It is an amenable number.

111534152021 is a deficient number, since it is larger than the sum of its proper divisors (145038679).

111534152021 is an equidigital number, since it uses as much as digits as its factorization.

111534152021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145038678.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 111534152021 its reverse (120251435111), we get a palindrome (231785587132).

The spelling of 111534152021 in words is "one hundred eleven billion, five hundred thirty-four million, one hundred fifty-two thousand, twenty-one".