21602765813641 has 16 divisors (see below), whose sum is σ = 21947334696000. Its totient is φ = 21259530120960.

The previous prime is 21602765813597. The next prime is 21602765813647. The reversal of 21602765813641 is 14631856720612.

It is a cyclic number.

It is not a de Polignac number, because 21602765813641 - 2³⁹ = 21053009999753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21602765813647) 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, 174532746 + ... + 174656476.

It is an arithmetic number, because the mean of its divisors is an integer number (1371708418500).

Almost surely, 2^{21602765813641} is an apocalyptic number.

It is an amenable number.

21602765813641 is a deficient number, since it is larger than the sum of its proper divisors (344568882359).

21602765813641 is a wasteful number, since it uses less digits than its factorization.

21602765813641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129096.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 21602765813641 in words is "twenty-one trillion, six hundred two billion, seven hundred sixty-five million, eight hundred thirteen thousand, six hundred forty-one".