21222000010 has 16 divisors (see below), whose sum is σ = 38209999176. Its totient is φ = 8486489088.

The previous prime is 21221999999. The next prime is 21222000013. The reversal of 21222000010 is 1000022212.

It can be written as a sum of positive squares in 4 ways, for example, as 10532301129 + 10689698881 = 102627^2 + 103391^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21222000013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250047 + ... + 323986.

Almost surely, 2^21222000010 is an apocalyptic number.

21222000010 is a deficient number, since it is larger than the sum of its proper divisors (16987999166).

21222000010 is a wasteful number, since it uses less digits than its factorization.

21222000010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577737.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21222000010 its reverse (1000022212), we get a palindrome (22222022222).

The spelling of 21222000010 in words is "twenty-one billion, two hundred twenty-two million, ten", and thus it is an aban number.