21002120101100 has 36 divisors (see below), whose sum is σ = 46634475061944. Its totient is φ = 8205479479680.

The previous prime is 21002120101009. The next prime is 21002120101147. The reversal of 21002120101100 is 110102120012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2442102689 + ... + 2442111288.

It is an arithmetic number, because the mean of its divisors is an integer number (1295402085054).

Almost surely, 2^{21002120101100} is an apocalyptic number.

21002120101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002120101100 is an abundant number, since it is smaller than the sum of its proper divisors (25632354960844).

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

21002120101100 is a wasteful number, since it uses less digits than its factorization.

21002120101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4884214034 (or 4884214027 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21002120101100 its reverse (110102120012), we get a palindrome (21112222221112).

The spelling of 21002120101100 in words is "twenty-one trillion, two billion, one hundred twenty million, one hundred one thousand, one hundred".