231220021302220 has 96 divisors (see below), whose sum is σ = 544767703441920. Its totient is φ = 81919954713600.

The previous prime is 231220021302199. The next prime is 231220021302229. The reversal of 231220021302220 is 22203120022132.

It is a junction number, because it is equal to n+sod(n) for n = 231220021302191 and 231220021302200.

It is not an unprimeable number, because it can be changed into a prime (231220021302229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117542994 + ... + 119493913.

It is an arithmetic number, because the mean of its divisors is an integer number (5674663577520).

Almost surely, 2^{231220021302220} is an apocalyptic number.

231220021302220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231220021302220 is an abundant number, since it is smaller than the sum of its proper divisors (313547682139700).

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

231220021302220 is a wasteful number, since it uses less digits than its factorization.

231220021302220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237037103 (or 237037101 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 231220021302220 its reverse (22203120022132), we get a palindrome (253423141324352).

The spelling of 231220021302220 in words is "two hundred thirty-one trillion, two hundred twenty billion, twenty-one million, three hundred two thousand, two hundred twenty".