21516231601627 has 16 divisors (see below), whose sum is σ = 25035938104320. Its totient is φ = 18108744378048.

The previous prime is 21516231601597. The next prime is 21516231601637. The reversal of 21516231601627 is 72610613261512.

It is a cyclic number.

It is not a de Polignac number, because 21516231601627 - 2³⁹ = 20966475787739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21516231601637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30041283 + ... + 30749164.

It is an arithmetic number, because the mean of its divisors is an integer number (1564746131520).

Almost surely, 2^{21516231601627} is an apocalyptic number.

21516231601627 is a deficient number, since it is larger than the sum of its proper divisors (3519706502693).

21516231601627 is an equidigital number, since it uses as much as digits as its factorization.

21516231601627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60791370.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 21516231601627 in words is "twenty-one trillion, five hundred sixteen billion, two hundred thirty-one million, six hundred one thousand, six hundred twenty-seven".