21621533002312 has 32 divisors (see below), whose sum is σ = 42244437497400. Its totient is φ = 10361791788544.

The previous prime is 21621533002309. The next prime is 21621533002411. The reversal of 21621533002312 is 21320033512612.

It can be written as a sum of positive squares in 4 ways, for example, as 19748833809156 + 1872699193156 = 4443966^2 + 1368466^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340100563 + ... + 340164130.

Almost surely, 2^{21621533002312} is an apocalyptic number.

It is an amenable number.

21621533002312 is a deficient number, since it is larger than the sum of its proper divisors (20622904495088).

21621533002312 is a wasteful number, since it uses less digits than its factorization.

21621533002312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680264865 (or 680264861 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 21621533002312 its reverse (21320033512612), we get a palindrome (42941566514924).

The spelling of 21621533002312 in words is "twenty-one trillion, six hundred twenty-one billion, five hundred thirty-three million, two thousand, three hundred twelve".