21112220000 has 60 divisors (see below), whose sum is σ = 51939277236. Its totient is φ = 8444880000.

The previous prime is 21112219991. The next prime is 21112220021. The reversal of 21112220000 is 2221112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 507806 + ... + 547805.

Almost surely, 2^21112220000 is an apocalyptic number.

21112220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112220000 is an abundant number, since it is smaller than the sum of its proper divisors (30827057236).

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

21112220000 is an equidigital number, since it uses as much as digits as its factorization.

21112220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055641 (or 1055618 counting only the distinct ones).

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

Adding to 21112220000 its reverse (2221112), we get a palindrome (21114441112).

The spelling of 21112220000 in words is "twenty-one billion, one hundred twelve million, two hundred twenty thousand".