21163222255 has 24 divisors (see below), whose sum is σ = 29554668720. Its totient is φ = 14505765120.

The previous prime is 21163222247. The next prime is 21163222261. The reversal of 21163222255 is 55222236112.

It is not a de Polignac number, because 21163222255 - 2³ = 21163222247 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 603031 + ... + 637159.

It is an arithmetic number, because the mean of its divisors is an integer number (1231444530).

Almost surely, 2^21163222255 is an apocalyptic number.

21163222255 is a deficient number, since it is larger than the sum of its proper divisors (8391446465).

21163222255 is a wasteful number, since it uses less digits than its factorization.

21163222255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36679 (or 36672 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

Adding to 21163222255 its reverse (55222236112), we get a palindrome (76385458367).

The spelling of 21163222255 in words is "twenty-one billion, one hundred sixty-three million, two hundred twenty-two thousand, two hundred fifty-five".