22021616015665 has 32 divisors (see below), whose sum is σ = 30342602163456. Its totient is φ = 15029839319040.

The previous prime is 22021616015573. The next prime is 22021616015699. The reversal of 22021616015665 is 56651061612022.

It is not a de Polignac number, because 22021616015665 - 2¹³ = 22021616007473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15101814 + ... + 16495696.

It is an arithmetic number, because the mean of its divisors is an integer number (948206317608).

Almost surely, 2^{22021616015665} is an apocalyptic number.

It is an amenable number.

22021616015665 is a deficient number, since it is larger than the sum of its proper divisors (8320986147791).

22021616015665 is a wasteful number, since it uses less digits than its factorization.

22021616015665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396009.

The product of its (nonzero) digits is 259200, while the sum is 43.

Adding to 22021616015665 its reverse (56651061612022), we get a palindrome (78672677627687).

The spelling of 22021616015665 in words is "twenty-two trillion, twenty-one billion, six hundred sixteen million, fifteen thousand, six hundred sixty-five".