312212021189 has 2 divisors, whose sum is σ = 312212021190. Its totient is φ = 312212021188.

The previous prime is 312212021161. The next prime is 312212021203. The reversal of 312212021189 is 981120212213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226544585089 + 85667436100 = 475967^2 + 292690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312212021189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312112021189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156106010594 + 156106010595.

It is an arithmetic number, because the mean of its divisors is an integer number (156106010595).

Almost surely, 2^312212021189 is an apocalyptic number.

It is an amenable number.

312212021189 is a deficient number, since it is larger than the sum of its proper divisors (1).

312212021189 is an equidigital number, since it uses as much as digits as its factorization.

312212021189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 312212021189 in words is "three hundred twelve billion, two hundred twelve million, twenty-one thousand, one hundred eighty-nine".