21722605220 has 48 divisors (see below), whose sum is σ = 45796251648. Its totient is φ = 8655050880.

The previous prime is 21722605211. The next prime is 21722605241. The reversal of 21722605220 is 2250622712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10135469 + ... + 10137611.

It is an arithmetic number, because the mean of its divisors is an integer number (954088576).

Almost surely, 2^21722605220 is an apocalyptic number.

21722605220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21722605220 is an abundant number, since it is smaller than the sum of its proper divisors (24073646428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21722605220 is a wasteful number, since it uses less digits than its factorization.

21722605220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900 (or 3898 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The spelling of 21722605220 in words is "twenty-one billion, seven hundred twenty-two million, six hundred five thousand, two hundred twenty".