21113011523542 has 64 divisors (see below), whose sum is σ = 35634733056000. Its totient is φ = 9322665795072.

The previous prime is 21113011523521. The next prime is 21113011523609. The reversal of 21113011523542 is 24532511031112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353805684 + ... + 353865352.

It is an arithmetic number, because the mean of its divisors is an integer number (556792704000).

Almost surely, 2^{21113011523542} is an apocalyptic number.

21113011523542 is a deficient number, since it is larger than the sum of its proper divisors (14521721532458).

21113011523542 is a wasteful number, since it uses less digits than its factorization.

21113011523542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64933.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 21113011523542 its reverse (24532511031112), we get a palindrome (45645522554654).

The spelling of 21113011523542 in words is "twenty-one trillion, one hundred thirteen billion, eleven million, five hundred twenty-three thousand, five hundred forty-two".