21222101000 has 64 divisors (see below), whose sum is σ = 50596818480. Its totient is φ = 8328652800.

The previous prime is 21222100981. The next prime is 21222101003. The reversal of 21222101000 is 10122212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2615504164 + 18606596836 = 51142^2 + 136406^2 .

It is not an unprimeable number, because it can be changed into a prime (21222101003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147209 + ... + 253208.

Almost surely, 2^21222101000 is an apocalyptic number.

21222101000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222101000 is an abundant number, since it is smaller than the sum of its proper divisors (29374717480).

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

21222101000 is a wasteful number, since it uses less digits than its factorization.

21222101000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400491 (or 400477 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21222101000 its reverse (10122212), we get a palindrome (21232223212).

The spelling of 21222101000 in words is "twenty-one billion, two hundred twenty-two million, one hundred one thousand".