912121312021 has 4 divisors (see below), whose sum is σ = 912125341600. Its totient is φ = 912117282444.

The previous prime is 912121312013. The next prime is 912121312087. The reversal of 912121312021 is 120213121219.

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.

It is a cyclic number.

It is not a de Polignac number, because 912121312021 - 2³ = 912121312013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (912121612021) 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, 1653681 + ... + 2135158.

It is an arithmetic number, because the mean of its divisors is an integer number (228031335400).

Almost surely, 2^912121312021 is an apocalyptic number.

It is an amenable number.

912121312021 is a deficient number, since it is larger than the sum of its proper divisors (4029579).

912121312021 is a wasteful number, since it uses less digits than its factorization.

912121312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029578.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 912121312021 in words is "nine hundred twelve billion, one hundred twenty-one million, three hundred twelve thousand, twenty-one".