23031212220 has 96 divisors (see below), whose sum is σ = 71688052800. Its totient is φ = 6138623232.

The previous prime is 23031212209. The next prime is 23031212227. The reversal of 23031212220 is 2221213032.

23031212220 is a `hidden beast` number, since 230 + 3 + 1 + 212 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 23031212193 and 23031212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23031212227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1215862 + ... + 1234658.

It is an arithmetic number, because the mean of its divisors is an integer number (746750550).

Almost surely, 2^23031212220 is an apocalyptic number.

23031212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23031212220 is an abundant number, since it is smaller than the sum of its proper divisors (48656840580).

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

23031212220 is a wasteful number, since it uses less digits than its factorization.

23031212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21084 (or 21076 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 23031212220 its reverse (2221213032), we get a palindrome (25252425252).

The spelling of 23031212220 in words is "twenty-three billion, thirty-one million, two hundred twelve thousand, two hundred twenty".