21200122121000 has 64 divisors (see below), whose sum is σ = 49609001594880. Its totient is φ = 8479926484800.

The previous prime is 21200122120987. The next prime is 21200122121021. The reversal of 21200122121000 is 12122100212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106003097 + ... + 106202903.

It is an arithmetic number, because the mean of its divisors is an integer number (775140649920).

Almost surely, 2^{21200122121000} is an apocalyptic number.

21200122121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200122121000 is an abundant number, since it is smaller than the sum of its proper divisors (28408879473880).

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

21200122121000 is a wasteful number, since it uses less digits than its factorization.

21200122121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305931 (or 305917 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21200122121000 its reverse (12122100212), we get a palindrome (21212244221212).

The spelling of 21200122121000 in words is "twenty-one trillion, two hundred billion, one hundred twenty-two million, one hundred twenty-one thousand".