312221012131 has 16 divisors (see below), whose sum is σ = 376475765760. Its totient is φ = 252944562240.

The previous prime is 312221012101. The next prime is 312221012149. The reversal of 312221012131 is 131210122213.

It is a cyclic number.

It is not a de Polignac number, because 312221012131 - 2²¹ = 312218914979 is a prime.

It is a super-2 number, since 2×312221012131² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312221012099 and 312221012108.

It is not an unprimeable number, because it can be changed into a prime (312221012101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2666026 + ... + 2780671.

It is an arithmetic number, because the mean of its divisors is an integer number (23529735360).

Almost surely, 2^312221012131 is an apocalyptic number.

312221012131 is a deficient number, since it is larger than the sum of its proper divisors (64254753629).

312221012131 is a wasteful number, since it uses less digits than its factorization.

312221012131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5447154.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 312221012131 its reverse (131210122213), we get a palindrome (443431134344).

The spelling of 312221012131 in words is "three hundred twelve billion, two hundred twenty-one million, twelve thousand, one hundred thirty-one".