21101000320120 has 32 divisors (see below), whose sum is σ = 54259715109600. Its totient is φ = 7234628681088.

The previous prime is 21101000320117. The next prime is 21101000320177. The reversal of 21101000320120 is 2102300010112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101000320120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37680357435 + ... + 37680357994.

It is an arithmetic number, because the mean of its divisors is an integer number (1695616097175).

Almost surely, 2^{21101000320120} is an apocalyptic number.

21101000320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101000320120 is an abundant number, since it is smaller than the sum of its proper divisors (33158714789480).

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

21101000320120 is a wasteful number, since it uses less digits than its factorization.

21101000320120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75360715447 (or 75360715443 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21101000320120 its reverse (2102300010112), we get a palindrome (23203300330232).

The spelling of 21101000320120 in words is "twenty-one trillion, one hundred one billion, three hundred twenty thousand, one hundred twenty".