21244793 has 4 divisors (see below), whose sum is σ = 22362960. Its totient is φ = 20126628.

The previous prime is 21244787. The next prime is 21244807. The reversal of 21244793 is 39744212.

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 21244793 - 2⁴ = 21244777 is a prime.

It is a super-2 number, since 2×21244793² = 902682459225698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244723) 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, 559055 + ... + 559092.

It is an arithmetic number, because the mean of its divisors is an integer number (5590740).

Almost surely, 2^21244793 is an apocalyptic number.

It is an amenable number.

21244793 is a deficient number, since it is larger than the sum of its proper divisors (1118167).

21244793 is a wasteful number, since it uses less digits than its factorization.

21244793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118166.

The product of its digits is 12096, while the sum is 32.

The square root of 21244793 is about 4609.2074155976. The cubic root of 21244793 is about 276.9602874598.

The spelling of 21244793 in words is "twenty-one million, two hundred forty-four thousand, seven hundred ninety-three".