21216224030512 has 120 divisors (see below), whose sum is σ = 47923392032496. Its totient is φ = 9072581543424.

The previous prime is 21216224030467. The next prime is 21216224030537. The reversal of 21216224030512 is 21503042261212.

It is a happy number.

It is a super-2 number, since 2×21216224030512² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1224027798 + ... + 1224045130.

Almost surely, 2^{21216224030512} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21216224030512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23961696016248).

21216224030512 is an abundant number, since it is smaller than the sum of its proper divisors (26707168001984).

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

21216224030512 is a wasteful number, since it uses less digits than its factorization.

21216224030512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20715 (or 20702 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 21216224030512 its reverse (21503042261212), we get a palindrome (42719266291724).

The spelling of 21216224030512 in words is "twenty-one trillion, two hundred sixteen billion, two hundred twenty-four million, thirty thousand, five hundred twelve".