22748021 has 4 divisors (see below), whose sum is σ = 22783200. Its totient is φ = 22712844.

The previous prime is 22748009. The next prime is 22748027. The reversal of 22748021 is 12084722.

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 22748021 - 2⁶ = 22747957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22748027) 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, 16601 + ... + 17918.

It is an arithmetic number, because the mean of its divisors is an integer number (5695800).

Almost surely, 2^22748021 is an apocalyptic number.

It is an amenable number.

22748021 is a deficient number, since it is larger than the sum of its proper divisors (35179).

22748021 is an equidigital number, since it uses as much as digits as its factorization.

22748021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35178.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 22748021 is about 4769.4885470038. The cubic root of 22748021 is about 283.3443389804.

The spelling of 22748021 in words is "twenty-two million, seven hundred forty-eight thousand, twenty-one".