21533153232542 has 32 divisors (see below), whose sum is σ = 37090079281920. Its totient is φ = 9184471390080.

The previous prime is 21533153232529. The next prime is 21533153232553. The reversal of 21533153232542 is 24523235133512.

It is a super-2 number, since 2×21533153232542² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21533153232542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114335009 + ... + 114523187.

It is an arithmetic number, because the mean of its divisors is an integer number (1159064977560).

Almost surely, 2^{21533153232542} is an apocalyptic number.

21533153232542 is a deficient number, since it is larger than the sum of its proper divisors (15556926049378).

21533153232542 is a wasteful number, since it uses less digits than its factorization.

21533153232542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227136.

The product of its digits is 648000, while the sum is 41.

The spelling of 21533153232542 in words is "twenty-one trillion, five hundred thirty-three billion, one hundred fifty-three million, two hundred thirty-two thousand, five hundred forty-two".