21222214220 has 12 divisors (see below), whose sum is σ = 44566649904. Its totient is φ = 8488885680.

The previous prime is 21222214207. The next prime is 21222214243. The reversal of 21222214220 is 2241222212.

It is a super-3 number, since 3×21222214220³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1061110711 = 21222214220 / (2 + 1 + 2 + 2 + 2 + 2 + 1 + 4 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21222214192 and 21222214201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530555336 + ... + 530555375.

It is an arithmetic number, because the mean of its divisors is an integer number (3713887492).

Almost surely, 2^21222214220 is an apocalyptic number.

21222214220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222214220 is an abundant number, since it is smaller than the sum of its proper divisors (23344435684).

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

21222214220 is a wasteful number, since it uses less digits than its factorization.

21222214220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061110720 (or 1061110718 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21222214220 its reverse (2241222212), we get a palindrome (23463436432).

The spelling of 21222214220 in words is "twenty-one billion, two hundred twenty-two million, two hundred fourteen thousand, two hundred twenty".