21487553266942 has 32 divisors (see below), whose sum is σ = 36990051081984. Its totient is φ = 9170392924800.

The previous prime is 21487553266871. The next prime is 21487553266961. The reversal of 21487553266942 is 24966235578412.

It is a super-2 number, since 2×21487553266942² (a number of 27 digits) contains 22 as substring.

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, 101826513 + ... + 102037315.

It is an arithmetic number, because the mean of its divisors is an integer number (1155939096312).

Almost surely, 2^{21487553266942} is an apocalyptic number.

21487553266942 is a deficient number, since it is larger than the sum of its proper divisors (15502497815042).

21487553266942 is a wasteful number, since it uses less digits than its factorization.

21487553266942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241264.

The product of its digits is 174182400, while the sum is 64.

The spelling of 21487553266942 in words is "twenty-one trillion, four hundred eighty-seven billion, five hundred fifty-three million, two hundred sixty-six thousand, nine hundred forty-two".