21470610665563 has 16 divisors (see below), whose sum is σ = 21725813947680. Its totient is φ = 21215722528000.

The previous prime is 21470610665531. The next prime is 21470610665573. The reversal of 21470610665563 is 36556601607412.

It is a cyclic number.

It is not a de Polignac number, because 21470610665563 - 2⁵ = 21470610665531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21470610665563.

It is not an unprimeable number, because it can be changed into a prime (21470610665503) 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, 1017505713 + ... + 1017526813.

It is an arithmetic number, because the mean of its divisors is an integer number (1357863371730).

Almost surely, 2^{21470610665563} is an apocalyptic number.

21470610665563 is a deficient number, since it is larger than the sum of its proper divisors (255203282117).

21470610665563 is a wasteful number, since it uses less digits than its factorization.

21470610665563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27998.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 21470610665563 in words is "twenty-one trillion, four hundred seventy billion, six hundred ten million, six hundred sixty-five thousand, five hundred sixty-three".