21101002021000 has 128 divisors (see below), whose sum is σ = 57033639336960. Its totient is φ = 7221733248000.

The previous prime is 21101002020997. The next prime is 21101002021007. The reversal of 21101002021000 is 12020010112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21101002021007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56232792 + ... + 56606791.

It is an arithmetic number, because the mean of its divisors is an integer number (445575307320).

Almost surely, 2^{21101002021000} is an apocalyptic number.

21101002021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101002021000 is an abundant number, since it is smaller than the sum of its proper divisors (35932637315960).

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

21101002021000 is a wasteful number, since it uses less digits than its factorization.

21101002021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112839632 (or 112839618 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101002021000 its reverse (12020010112), we get a palindrome (21113022031112).

The spelling of 21101002021000 in words is "twenty-one trillion, one hundred one billion, two million, twenty-one thousand".