312021323220 has 24 divisors (see below), whose sum is σ = 873659705184. Its totient is φ = 83205686176.

The previous prime is 312021323209. The next prime is 312021323239. The reversal of 312021323220 is 22323120213.

It is a happy number.

It is a super-2 number, since 2×312021323220² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 2600177634 + ... + 2600177753.

It is an arithmetic number, because the mean of its divisors is an integer number (36402487716).

Almost surely, 2^312021323220 is an apocalyptic number.

312021323220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312021323220 is an abundant number, since it is smaller than the sum of its proper divisors (561638381964).

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

312021323220 is a wasteful number, since it uses less digits than its factorization.

312021323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200355399 (or 5200355397 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 312021323220 its reverse (22323120213), we get a palindrome (334344443433).

The spelling of 312021323220 in words is "three hundred twelve billion, twenty-one million, three hundred twenty-three thousand, two hundred twenty".