312011412521 has 4 divisors (see below), whose sum is σ = 312735337344. Its totient is φ = 311287487700.

The previous prime is 312011412511. The next prime is 312011412539. The reversal of 312011412521 is 125214110213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125214110213 = 19 ⋅6590216327.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312011412521 is a prime.

It is a super-2 number, since 2×312011412521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312011412511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361961765 + ... + 361962626.

It is an arithmetic number, because the mean of its divisors is an integer number (78183834336).

Almost surely, 2^312011412521 is an apocalyptic number.

It is an amenable number.

312011412521 is a deficient number, since it is larger than the sum of its proper divisors (723924823).

312011412521 is an equidigital number, since it uses as much as digits as its factorization.

312011412521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723924822.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 312011412521 its reverse (125214110213), we get a palindrome (437225522734).

The spelling of 312011412521 in words is "three hundred twelve billion, eleven million, four hundred twelve thousand, five hundred twenty-one".