92721921 has 4 divisors (see below), whose sum is σ = 123629232. Its totient is φ = 61814612.

The previous prime is 92721911. The next prime is 92721943. The reversal of 92721921 is 12912729.

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 92721921 - 2¹⁰ = 92720897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (92721911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15453651 + ... + 15453656.

It is an arithmetic number, because the mean of its divisors is an integer number (30907308).

Almost surely, 2^92721921 is an apocalyptic number.

It is an amenable number.

92721921 is a deficient number, since it is larger than the sum of its proper divisors (30907311).

92721921 is a wasteful number, since it uses less digits than its factorization.

92721921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30907310.

The product of its digits is 4536, while the sum is 33.

The square root of 92721921 is about 9629.2222427359. Note that the first 4 decimals coincide. The cubic root of 92721921 is about 452.6134688937.

The spelling of 92721921 in words is "ninety-two million, seven hundred twenty-one thousand, nine hundred twenty-one".