21232231213220 has 24 divisors (see below), whose sum is σ = 44588524344000. Its totient is φ = 8492732714592.

The previous prime is 21232231213189. The next prime is 21232231213243. The reversal of 21232231213220 is 2231213223212.

It is a self number, because there is not a number n which added to its sum of digits gives 21232231213220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8893040 + ... + 11024999.

It is an arithmetic number, because the mean of its divisors is an integer number (1857855181000).

Almost surely, 2^{21232231213220} is an apocalyptic number.

21232231213220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232231213220 is an abundant number, since it is smaller than the sum of its proper divisors (23356293130780).

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

21232231213220 is a wasteful number, since it uses less digits than its factorization.

21232231213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19971347 (or 19971345 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21232231213220 its reverse (2231213223212), we get a palindrome (23463444436432).

The spelling of 21232231213220 in words is "twenty-one trillion, two hundred thirty-two billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred twenty".