21615544051233 has 16 divisors (see below), whose sum is σ = 33290249662656. Its totient is φ = 12329722096640.

The previous prime is 21615544051229. The next prime is 21615544051243. The reversal of 21615544051233 is 33215044551612.

It is a cyclic number.

It is not a de Polignac number, because 21615544051233 - 2² = 21615544051229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21615544051243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19265190216 + ... + 19265191337.

It is an arithmetic number, because the mean of its divisors is an integer number (2080640603916).

Almost surely, 2^{21615544051233} is an apocalyptic number.

It is an amenable number.

21615544051233 is a deficient number, since it is larger than the sum of its proper divisors (11674705611423).

21615544051233 is a wasteful number, since it uses less digits than its factorization.

21615544051233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38530381584.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 21615544051233 in words is "twenty-one trillion, six hundred fifteen billion, five hundred forty-four million, fifty-one thousand, two hundred thirty-three".