21102212000 has 48 divisors (see below), whose sum is σ = 51848144712. Its totient is φ = 8440883200.

The previous prime is 21102211997. The next prime is 21102212051. The reversal of 21102212000 is 21220112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11238544144 + 9863667856 = 106012^2 + 99316^2 .

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, 2633777 + ... + 2641776.

Almost surely, 2^21102212000 is an apocalyptic number.

21102212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102212000 is an abundant number, since it is smaller than the sum of its proper divisors (30745932712).

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

21102212000 is an equidigital number, since it uses as much as digits as its factorization.

21102212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275578 (or 5275560 counting only the distinct ones).

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

Adding to 21102212000 its reverse (21220112), we get a palindrome (21123432112).

The spelling of 21102212000 in words is "twenty-one billion, one hundred two million, two hundred twelve thousand".