21155015036045 has 16 divisors (see below), whose sum is σ = 28648797793920. Its totient is φ = 14854932187200.

The previous prime is 21155015036021. The next prime is 21155015036101. The reversal of 21155015036045 is 54063051055112.

It is not a de Polignac number, because 21155015036045 - 2³⁸ = 20880137129101 is a prime.

It is a super-2 number, since 2×21155015036045² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 6631664561 + ... + 6631667750.

It is an arithmetic number, because the mean of its divisors is an integer number (1790549862120).

Almost surely, 2^{21155015036045} is an apocalyptic number.

It is an amenable number.

21155015036045 is a deficient number, since it is larger than the sum of its proper divisors (7493782757875).

21155015036045 is a wasteful number, since it uses less digits than its factorization.

21155015036045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13263332356.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 21155015036045 in words is "twenty-one trillion, one hundred fifty-five billion, fifteen million, thirty-six thousand, forty-five".