21015000555105 has 64 divisors (see below), whose sum is σ = 35480021760000. Its totient is φ = 10592214700032.

The previous prime is 21015000555071. The next prime is 21015000555151. The reversal of 21015000555105 is 50155500051012.

It is not a de Polignac number, because 21015000555105 - 2²² = 21014996360801 is a prime.

It is a super-2 number, since 2×21015000555105² (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 63 ways as a sum of consecutive naturals, for example, 721580074 + ... + 721609196.

It is an arithmetic number, because the mean of its divisors is an integer number (554375340000).

Almost surely, 2^{21015000555105} is an apocalyptic number.

It is an amenable number.

21015000555105 is a deficient number, since it is larger than the sum of its proper divisors (14465021204895).

21015000555105 is a wasteful number, since it uses less digits than its factorization.

21015000555105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35238.

The product of its (nonzero) digits is 6250, while the sum is 30.

The spelling of 21015000555105 in words is "twenty-one trillion, fifteen billion, five hundred fifty-five thousand, one hundred five".