2312021220 has 48 divisors (see below), whose sum is σ = 6648629568. Its totient is φ = 599875200.

The previous prime is 2312021197. The next prime is 2312021237. The reversal of 2312021220 is 221202132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2312021220.

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, 518506 + ... + 522945.

It is an arithmetic number, because the mean of its divisors is an integer number (138513116).

Almost surely, 2^2312021220 is an apocalyptic number.

2312021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2312021220 is an abundant number, since it is smaller than the sum of its proper divisors (4336608348).

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

2312021220 is a wasteful number, since it uses less digits than its factorization.

2312021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041500 (or 1041498 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2312021220 is about 48083.4817790892. The cubic root of 2312021220 is about 1322.3018491174.

Adding to 2312021220 its reverse (221202132), we get a palindrome (2533223352).

The spelling of 2312021220 in words is "two billion, three hundred twelve million, twenty-one thousand, two hundred twenty".