312221155440 has 80 divisors (see below), whose sum is σ = 1024820041248. Its totient is φ = 78361387008.

The previous prime is 312221155369. The next prime is 312221155507. The reversal of 312221155440 is 44551122213.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 312221155398 and 312221155407.

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, 38258317 + ... + 38266476.

Almost surely, 2^312221155440 is an apocalyptic number.

312221155440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312221155440 is an abundant number, since it is smaller than the sum of its proper divisors (712598885808).

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

312221155440 is a wasteful number, since it uses less digits than its factorization.

312221155440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76524826 (or 76524820 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 312221155440 its reverse (44551122213), we get a palindrome (356772277653).

The spelling of 312221155440 in words is "three hundred twelve billion, two hundred twenty-one million, one hundred fifty-five thousand, four hundred forty".