92721421 has 4 divisors (see below), whose sum is σ = 99853852. Its totient is φ = 85588992.

The previous prime is 92721397. The next prime is 92721437. The reversal of 92721421 is 12412729.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25300900 + 67420521 = 5030^2 + 8211^2 .

It is a cyclic number.

It is not a de Polignac number, because 92721421 - 2²³ = 84332813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 92721421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (92721481) 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, 3566196 + ... + 3566221.

It is an arithmetic number, because the mean of its divisors is an integer number (24963463).

Almost surely, 2^92721421 is an apocalyptic number.

It is an amenable number.

92721421 is a deficient number, since it is larger than the sum of its proper divisors (7132431).

92721421 is a wasteful number, since it uses less digits than its factorization.

92721421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7132430.

The product of its digits is 2016, while the sum is 28.

The square root of 92721421 is about 9629.1962800641. The cubic root of 92721421 is about 452.6126553243.

The spelling of 92721421 in words is "ninety-two million, seven hundred twenty-one thousand, four hundred twenty-one".