21120000020000 has 120 divisors (see below), whose sum is σ = 59380992449856. Its totient is φ = 7241142816000.

The previous prime is 21120000019969. The next prime is 21120000020017. The reversal of 21120000020000 is 2000002112.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21120000020000.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75288572 + ... + 75568571.

Almost surely, 2^{21120000020000} is an apocalyptic number.

21120000020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120000020000 is an abundant number, since it is smaller than the sum of its proper divisors (38260992429856).

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

21120000020000 is an equidigital number, since it uses as much as digits as its factorization.

21120000020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150857180 (or 150857157 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21120000020000 its reverse (2000002112), we get a palindrome (21122000022112).

The spelling of 21120000020000 in words is "twenty-one trillion, one hundred twenty billion, twenty thousand".