21292673 has 4 divisors (see below), whose sum is σ = 22413360. Its totient is φ = 20171988.

The previous prime is 21292669. The next prime is 21292681. The reversal of 21292673 is 37629212.

It is a happy number.

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 21292673 - 2² = 21292669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21292613) 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, 560315 + ... + 560352.

It is an arithmetic number, because the mean of its divisors is an integer number (5603340).

Almost surely, 2^21292673 is an apocalyptic number.

It is an amenable number.

21292673 is a deficient number, since it is larger than the sum of its proper divisors (1120687).

21292673 is a wasteful number, since it uses less digits than its factorization.

21292673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120686.

The product of its digits is 9072, while the sum is 32.

The square root of 21292673 is about 4614.3984440011. The cubic root of 21292673 is about 277.1681957990.

The spelling of 21292673 in words is "twenty-one million, two hundred ninety-two thousand, six hundred seventy-three".