21021203331100 has 72 divisors (see below), whose sum is σ = 52232647709088. Its totient is φ = 7193436057600.

The previous prime is 21021203331019. The next prime is 21021203331109. The reversal of 21021203331100 is 113330212012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021203331109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28455157 + ... + 29184556.

It is an arithmetic number, because the mean of its divisors is an integer number (725453440404).

Almost surely, 2^{21021203331100} is an apocalyptic number.

21021203331100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021203331100 is an abundant number, since it is smaller than the sum of its proper divisors (31211444377988).

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

21021203331100 is a wasteful number, since it uses less digits than its factorization.

21021203331100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57640255 (or 57640248 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21021203331100 its reverse (113330212012), we get a palindrome (21134533543112).

The spelling of 21021203331100 in words is "twenty-one trillion, twenty-one billion, two hundred three million, three hundred thirty-one thousand, one hundred".