991212032212323 has 16 divisors (see below), whose sum is σ = 1321733610072096. Its totient is φ = 660749239388160.

The previous prime is 991212032212321. The next prime is 991212032212333. The reversal of 991212032212323 is 323212230212199.

It is not a de Polignac number, because 991212032212323 - 2¹ = 991212032212321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991212032212321) 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, 3801214315 + ... + 3801475067.

It is an arithmetic number, because the mean of its divisors is an integer number (82608350629506).

Almost surely, 2^{991212032212323} is an apocalyptic number.

991212032212323 is a deficient number, since it is larger than the sum of its proper divisors (330521577859773).

991212032212323 is a wasteful number, since it uses less digits than its factorization.

991212032212323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368614.

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 991212032212323 in words is "nine hundred ninety-one trillion, two hundred twelve billion, thirty-two million, two hundred twelve thousand, three hundred twenty-three".