21013321321100 has 36 divisors (see below), whose sum is σ = 45603764901408. Its totient is φ = 8404433112000.

The previous prime is 21013321321099. The next prime is 21013321321123. The reversal of 21013321321100 is 112312331012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 10248911 + ... + 12127110.

Almost surely, 2^{21013321321100} is an apocalyptic number.

21013321321100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013321321100 is an abundant number, since it is smaller than the sum of its proper divisors (24590443580308).

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

21013321321100 is a wasteful number, since it uses less digits than its factorization.

21013321321100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22385426 (or 22385419 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21013321321100 its reverse (112312331012), we get a palindrome (21125633652112).

The spelling of 21013321321100 in words is "twenty-one trillion, thirteen billion, three hundred twenty-one million, three hundred twenty-one thousand, one hundred".