21755407764041 has 32 divisors (see below), whose sum is σ = 26484411709440. Its totient is φ = 17445140315136.

The previous prime is 21755407764017. The next prime is 21755407764061. The reversal of 21755407764041 is 14046770455712.

It is a cyclic number.

It is not a de Polignac number, because 21755407764041 - 2²⁶ = 21755340655177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21755407764061) 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, 15883751 + ... + 17198963.

It is an arithmetic number, because the mean of its divisors is an integer number (827637865920).

Almost surely, 2^{21755407764041} is an apocalyptic number.

It is an amenable number.

21755407764041 is a deficient number, since it is larger than the sum of its proper divisors (4729003945399).

21755407764041 is a wasteful number, since it uses less digits than its factorization.

21755407764041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316073.

The product of its (nonzero) digits is 6585600, while the sum is 53.

The spelling of 21755407764041 in words is "twenty-one trillion, seven hundred fifty-five billion, four hundred seven million, seven hundred sixty-four thousand, forty-one".