21670552863 has 32 divisors (see below), whose sum is σ = 32240332800. Its totient is φ = 14386049568.

The previous prime is 21670552861. The next prime is 21670552877. The reversal of 21670552863 is 36825507612.

21670552863 is a `hidden beast` number, since 2 + 1 + 67 + 0 + 5 + 528 + 63 = 666.

It is not a de Polignac number, because 21670552863 - 2¹ = 21670552861 is a prime.

It is a super-2 number, since 2×21670552863² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21670552861) 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, 9817906 + ... + 9820112.

It is an arithmetic number, because the mean of its divisors is an integer number (1007510400).

Almost surely, 2^21670552863 is an apocalyptic number.

21670552863 is a deficient number, since it is larger than the sum of its proper divisors (10569779937).

21670552863 is a wasteful number, since it uses less digits than its factorization.

21670552863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588 (or 3582 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 21670552863 in words is "twenty-one billion, six hundred seventy million, five hundred fifty-two thousand, eight hundred sixty-three".