21201122111000 has 128 divisors (see below), whose sum is σ = 53945538192000. Its totient is φ = 7752105100800.

The previous prime is 21201122110999. The next prime is 21201122111023. The reversal of 21201122111000 is 11122110212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6577775 + ... + 9255774.

It is an arithmetic number, because the mean of its divisors is an integer number (421449517125).

Almost surely, 2^{21201122111000} is an apocalyptic number.

21201122111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201122111000 is an abundant number, since it is smaller than the sum of its proper divisors (32744416081000).

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

21201122111000 is a wasteful number, since it uses less digits than its factorization.

21201122111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15833686 (or 15833672 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201122111000 its reverse (11122110212), we get a palindrome (21212244221212).

The spelling of 21201122111000 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, one hundred eleven thousand".