21616025044651 has 4 divisors (see below), whose sum is σ = 21616062880192. Its totient is φ = 21615987209112.

The previous prime is 21616025044631. The next prime is 21616025044693. The reversal of 21616025044651 is 15644052061612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21616025044651 - 2¹⁵ = 21616025011883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21616025044598 and 21616025044607.

It is not an unprimeable number, because it can be changed into a prime (21616025044631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18047451 + ... + 19207876.

It is an arithmetic number, because the mean of its divisors is an integer number (5404015720048).

Almost surely, 2^{21616025044651} is an apocalyptic number.

21616025044651 is a deficient number, since it is larger than the sum of its proper divisors (37835541).

21616025044651 is an equidigital number, since it uses as much as digits as its factorization.

21616025044651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37835540.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 21616025044651 in words is "twenty-one trillion, six hundred sixteen billion, twenty-five million, forty-four thousand, six hundred fifty-one".