21030213231220 has 96 divisors (see below), whose sum is σ = 44699655651840. Its totient is φ = 8310760765440.

The previous prime is 21030213231191. The next prime is 21030213231229. The reversal of 21030213231220 is 2213231203012.

It is a junction number, because it is equal to n+sod(n) for n = 21030213231191 and 21030213231200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030213231229) 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, 319686972 + ... + 319752748.

It is an arithmetic number, because the mean of its divisors is an integer number (465621413040).

Almost surely, 2^{21030213231220} is an apocalyptic number.

21030213231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030213231220 is an abundant number, since it is smaller than the sum of its proper divisors (23669442420620).

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

21030213231220 is a wasteful number, since it uses less digits than its factorization.

21030213231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66553 (or 66551 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21030213231220 its reverse (2213231203012), we get a palindrome (23243444434232).

The spelling of 21030213231220 in words is "twenty-one trillion, thirty billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred twenty".