20331221231220 has 48 divisors (see below), whose sum is σ = 58890433916160. Its totient is φ = 5234705236096.

The previous prime is 20331221231219. The next prime is 20331221231261. The reversal of 20331221231220 is 2213212213302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5842303212 + ... + 5842306691.

It is an arithmetic number, because the mean of its divisors is an integer number (1226884039920).

Almost surely, 2^{20331221231220} is an apocalyptic number.

20331221231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20331221231220 is an abundant number, since it is smaller than the sum of its proper divisors (38559212684940).

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

20331221231220 is a wasteful number, since it uses less digits than its factorization.

20331221231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11684609944 (or 11684609942 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 20331221231220 its reverse (2213212213302), we get a palindrome (22544433444522).

The spelling of 20331221231220 in words is "twenty trillion, three hundred thirty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty".