21120221020100 has 72 divisors (see below), whose sum is σ = 46899109702368. Its totient is φ = 8251199712000.

The previous prime is 21120221020027. The next prime is 21120221020139. The reversal of 21120221020100 is 102012202112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91909547 + ... + 92139053.

It is an arithmetic number, because the mean of its divisors is an integer number (651376523644).

Almost surely, 2^{21120221020100} is an apocalyptic number.

21120221020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120221020100 is an abundant number, since it is smaller than the sum of its proper divisors (25778888682268).

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

21120221020100 is a wasteful number, since it uses less digits than its factorization.

21120221020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250965 (or 250958 counting only the distinct ones).

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

Adding to 21120221020100 its reverse (102012202112), we get a palindrome (21222233222212).

The spelling of 21120221020100 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, twenty thousand, one hundred".