21663745562 has 32 divisors (see below), whose sum is σ = 34233798144. Its totient is φ = 10268596800.

The previous prime is 21663745559. The next prime is 21663745573. The reversal of 21663745562 is 26554736612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 737468 + ... + 766280.

It is an arithmetic number, because the mean of its divisors is an integer number (1069806192).

Almost surely, 2^21663745562 is an apocalyptic number.

21663745562 is a deficient number, since it is larger than the sum of its proper divisors (12570052582).

21663745562 is a wasteful number, since it uses less digits than its factorization.

21663745562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29094.

The product of its digits is 1814400, while the sum is 47.

The spelling of 21663745562 in words is "twenty-one billion, six hundred sixty-three million, seven hundred forty-five thousand, five hundred sixty-two".