21792023 has 4 divisors (see below), whose sum is σ = 23773128. Its totient is φ = 19810920.

The previous prime is 21792007. The next prime is 21792049. The reversal of 21792023 is 32029712.

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

It is a cyclic number.

It is not a de Polignac number, because 21792023 - 2⁴ = 21792007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21791983 and 21792001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21792073) 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, 990536 + ... + 990557.

It is an arithmetic number, because the mean of its divisors is an integer number (5943282).

Almost surely, 2^21792023 is an apocalyptic number.

21792023 is a deficient number, since it is larger than the sum of its proper divisors (1981105).

21792023 is a wasteful number, since it uses less digits than its factorization.

21792023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981104.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21792023 is about 4668.1926909672. The cubic root of 21792023 is about 279.3181666827.

The spelling of 21792023 in words is "twenty-one million, seven hundred ninety-two thousand, twenty-three".