21231220223320 has 64 divisors (see below), whose sum is σ = 49935414067200. Its totient is φ = 8114504711040.

The previous prime is 21231220223309. The next prime is 21231220223329. The reversal of 21231220223320 is 2332202213212.

21231220223320 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21231220223320² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231220223329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108268824 + ... + 108464743.

It is an arithmetic number, because the mean of its divisors is an integer number (780240844800).

Almost surely, 2^{21231220223320} is an apocalyptic number.

21231220223320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231220223320 is an abundant number, since it is smaller than the sum of its proper divisors (28704193843880).

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

21231220223320 is a wasteful number, since it uses less digits than its factorization.

21231220223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216733688 (or 216733684 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21231220223320 its reverse (2332202213212), we get a palindrome (23563422436532).

The spelling of 21231220223320 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred twenty million, two hundred twenty-three thousand, three hundred twenty".