21113213105252 has 12 divisors (see below), whose sum is σ = 38139997867776. Its totient is φ = 10216070857320.

The previous prime is 21113213105249. The next prime is 21113213105321. The reversal of 21113213105252 is 25250131231112.

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, 85133923688 + ... + 85133923935.

It is an arithmetic number, because the mean of its divisors is an integer number (3178333155648).

Almost surely, 2^{21113213105252} is an apocalyptic number.

It is an amenable number.

21113213105252 is a deficient number, since it is larger than the sum of its proper divisors (17026784762524).

21113213105252 is a wasteful number, since it uses less digits than its factorization.

21113213105252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170267847658 (or 170267847656 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 21113213105252 its reverse (25250131231112), we get a palindrome (46363344336364).

The spelling of 21113213105252 in words is "twenty-one trillion, one hundred thirteen billion, two hundred thirteen million, one hundred five thousand, two hundred fifty-two".