21120021112000 has 112 divisors (see below), whose sum is σ = 52891416452160. Its totient is φ = 8353086720000.

The previous prime is 21120021111997. The next prime is 21120021112009. The reversal of 21120021112000 is 21112002112.

It is not an unprimeable number, because it can be changed into a prime (21120021112009) 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, 14119476 + ... + 15543475.

Almost surely, 2^{21120021112000} is an apocalyptic number.

21120021112000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120021112000 is an abundant number, since it is smaller than the sum of its proper divisors (31771395340160).

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

21120021112000 is an equidigital number, since it uses as much as digits as its factorization.

21120021112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29663067 (or 29663047 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120021112000 its reverse (21112002112), we get a palindrome (21141133114112).

The spelling of 21120021112000 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, one hundred twelve thousand".