21565163222 has 16 divisors (see below), whose sum is σ = 33468130800. Its totient is φ = 10409229600.

The previous prime is 21565163209. The next prime is 21565163281. The reversal of 21565163222 is 22236156512.

It is a super-3 number, since 3×21565163222³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434729 + ... + 481787.

It is an arithmetic number, because the mean of its divisors is an integer number (2091758175).

Almost surely, 2^21565163222 is an apocalyptic number.

21565163222 is a deficient number, since it is larger than the sum of its proper divisors (11902967578).

21565163222 is a wasteful number, since it uses less digits than its factorization.

21565163222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54991.

The product of its digits is 43200, while the sum is 35.

The spelling of 21565163222 in words is "twenty-one billion, five hundred sixty-five million, one hundred sixty-three thousand, two hundred twenty-two".