492147205921 has 12 divisors (see below), whose sum is σ = 572534965332. Its totient is φ = 421813055328.

The previous prime is 492147205873. The next prime is 492147205933. The reversal of 492147205921 is 129502741294.

It can be written as a sum of positive squares in 2 ways, for example, as 119345375296 + 372801830625 = 345464^2 + 610575^2 .

It is a de Polignac number, because none of the positive numbers 2^k-492147205921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (492147208921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454491 + ... + 1091263.

It is an arithmetic number, because the mean of its divisors is an integer number (47711247111).

Almost surely, 2^492147205921 is an apocalyptic number.

It is an amenable number.

492147205921 is a deficient number, since it is larger than the sum of its proper divisors (80387759411).

492147205921 is a wasteful number, since it uses less digits than its factorization.

492147205921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652560 (or 652553 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 492147205921 in words is "four hundred ninety-two billion, one hundred forty-seven million, two hundred five thousand, nine hundred twenty-one".