21210224967936 has 81 divisors (see below), whose sum is σ = 61154944874751. Its totient is φ = 7070001302016.

The previous prime is 21210224967871. The next prime is 21210224967949. The reversal of 21210224967936 is 63976942201212.

It is a happy number.

The square root of 21210224967936 is 4605456.

It is a perfect power (a square), and thus also a powerful number.

21210224967936 is a `hidden beast` number, since 2 + 12 + 102 + 2 + 496 + 7 + 9 + 36 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 221013915 + ... + 221109861.

Almost surely, 2^{21210224967936} is an apocalyptic number.

21210224967936 is the 4605456-th square number.

It is an amenable number.

21210224967936 is an abundant number, since it is smaller than the sum of its proper divisors (39944719906815).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210224967936 is an frugal number, since it uses more digits than its factorization.

21210224967936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191916 (or 95952 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 21210224967936 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-four million, nine hundred sixty-seven thousand, nine hundred thirty-six".