21616231105515 has 32 divisors (see below), whose sum is σ = 35430806025216. Its totient is φ = 11247064759040.

The previous prime is 21616231105499. The next prime is 21616231105517. The reversal of 21616231105515 is 51550113261612.

It is not a de Polignac number, because 21616231105515 - 2⁴ = 21616231105499 is a prime.

It is a super-2 number, since 2×21616231105515² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21616231105517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16849102 + ... + 18086588.

It is an arithmetic number, because the mean of its divisors is an integer number (1107212688288).

Almost surely, 2^{21616231105515} is an apocalyptic number.

21616231105515 is a deficient number, since it is larger than the sum of its proper divisors (13814574919701).

21616231105515 is a wasteful number, since it uses less digits than its factorization.

21616231105515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265939.

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 21616231105515 in words is "twenty-one trillion, six hundred sixteen billion, two hundred thirty-one million, one hundred five thousand, five hundred fifteen".