21261022352016 has 80 divisors (see below), whose sum is σ = 58169907137664. Its totient is φ = 6668432013312.

The previous prime is 21261022351993. The next prime is 21261022352023. The reversal of 21261022352016 is 61025322016212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86491 + ... + 6521466.

Almost surely, 2^{21261022352016} is an apocalyptic number.

It is an amenable number.

21261022352016 is an abundant number, since it is smaller than the sum of its proper divisors (36908884785648).

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

21261022352016 is a wasteful number, since it uses less digits than its factorization.

21261022352016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6611928 (or 6611922 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 21261022352016 its reverse (61025322016212), we get a palindrome (82286344368228).

The spelling of 21261022352016 in words is "twenty-one trillion, two hundred sixty-one billion, twenty-two million, three hundred fifty-two thousand, sixteen".