21001002320100 has 144 divisors (see below), whose sum is σ = 68078335582656. Its totient is φ = 4953553344000.

The previous prime is 21001002320069. The next prime is 21001002320227. The reversal of 21001002320100 is 102320010012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85877091 + ... + 86121290.

It is an arithmetic number, because the mean of its divisors is an integer number (472766219324).

Almost surely, 2^{21001002320100} is an apocalyptic number.

21001002320100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001002320100 is an abundant number, since it is smaller than the sum of its proper divisors (47077333262556).

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

21001002320100 is a wasteful number, since it uses less digits than its factorization.

21001002320100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171998446 (or 171998439 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21001002320100 its reverse (102320010012), we get a palindrome (21103322330112).

The spelling of 21001002320100 in words is "twenty-one trillion, one billion, two million, three hundred twenty thousand, one hundred".