21113402524 has 24 divisors (see below), whose sum is σ = 37157324400. Its totient is φ = 10497076224.

The previous prime is 21113402477. The next prime is 21113402549. The reversal of 21113402524 is 42520431112.

It is a super-2 number, since 2×21113402524² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2078562 + ... + 2088694.

It is an arithmetic number, because the mean of its divisors is an integer number (1548221850).

Almost surely, 2^21113402524 is an apocalyptic number.

It is an amenable number.

21113402524 is a deficient number, since it is larger than the sum of its proper divisors (16043921876).

21113402524 is a wasteful number, since it uses less digits than its factorization.

21113402524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13029 (or 13027 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21113402524 its reverse (42520431112), we get a palindrome (63633833636).

The spelling of 21113402524 in words is "twenty-one billion, one hundred thirteen million, four hundred two thousand, five hundred twenty-four".