312222213021 has 32 divisors (see below), whose sum is σ = 449291427840. Its totient is φ = 192296491200.

The previous prime is 312222213013. The next prime is 312222213031. The reversal of 312222213021 is 120312222213.

312222213021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 312222213021 - 2³ = 312222213013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312222213011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 945366 + ... + 1232136.

It is an arithmetic number, because the mean of its divisors is an integer number (14040357120).

Almost surely, 2^312222213021 is an apocalyptic number.

312222213021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

312222213021 is a deficient number, since it is larger than the sum of its proper divisors (137069214819).

312222213021 is a wasteful number, since it uses less digits than its factorization.

312222213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287337.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 312222213021 its reverse (120312222213), we get a palindrome (432534435234).

The spelling of 312222213021 in words is "three hundred twelve billion, two hundred twenty-two million, two hundred thirteen thousand, twenty-one".