21404511512 has 16 divisors (see below), whose sum is σ = 40136118360. Its totient is φ = 10701546624.

The previous prime is 21404511463. The next prime is 21404511539. The reversal of 21404511512 is 21511540412.

It is a happy number.

It is a super-2 number, since 2×21404511512² (a number of 21 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 3 ways as a sum of consecutive naturals, for example, 52943 + ... + 213569.

Almost surely, 2^21404511512 is an apocalyptic number.

It is an amenable number.

21404511512 is a deficient number, since it is larger than the sum of its proper divisors (18731606848).

21404511512 is a wasteful number, since it uses less digits than its factorization.

21404511512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177290 (or 177286 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The spelling of 21404511512 in words is "twenty-one billion, four hundred four million, five hundred eleven thousand, five hundred twelve".