21031003100220 has 96 divisors (see below), whose sum is σ = 62364225950208. Its totient is φ = 5284363636992.

The previous prime is 21031003100147. The next prime is 21031003100221. The reversal of 21031003100220 is 2200130013012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21031003100220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031003100221) 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, 113637819 + ... + 113822738.

It is an arithmetic number, because the mean of its divisors is an integer number (649627353648).

Almost surely, 2^{21031003100220} is an apocalyptic number.

21031003100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031003100220 is an abundant number, since it is smaller than the sum of its proper divisors (41333222849988).

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

21031003100220 is a wasteful number, since it uses less digits than its factorization.

21031003100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227460659 (or 227460657 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21031003100220 its reverse (2200130013012), we get a palindrome (23231133113232).

The spelling of 21031003100220 in words is "twenty-one trillion, thirty-one billion, three million, one hundred thousand, two hundred twenty".