21011122020000 has 240 divisors, whose sum is σ = 78766495803072. Its totient is φ = 4802542080000.

The previous prime is 21011122019999. The next prime is 21011122020041. The reversal of 21011122020000 is 2022111012.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 24593241 + ... + 25433240.

Almost surely, 2^{21011122020000} is an apocalyptic number.

21011122020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011122020000 is an abundant number, since it is smaller than the sum of its proper divisors (57755373783072).

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

21011122020000 is an equidigital number, since it uses as much as digits as its factorization.

21011122020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50026521 (or 50026498 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21011122020000 its reverse (2022111012), we get a palindrome (21013144131012).

The spelling of 21011122020000 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, twenty thousand".