21094753 has 4 divisors (see below), whose sum is σ = 21104560. Its totient is φ = 21084948.

The previous prime is 21094747. The next prime is 21094771. The reversal of 21094753 is 35749012.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21094753 - 2⁵ = 21094721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21094783) 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, 123 + ... + 6496.

It is an arithmetic number, because the mean of its divisors is an integer number (5276140).

Almost surely, 2^21094753 is an apocalyptic number.

It is an amenable number.

21094753 is a deficient number, since it is larger than the sum of its proper divisors (9807).

21094753 is an equidigital number, since it uses as much as digits as its factorization.

21094753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9806.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 21094753 is about 4592.9024592299. The cubic root of 21094753 is about 276.3067416870.

The spelling of 21094753 in words is "twenty-one million, ninety-four thousand, seven hundred fifty-three".