22723421 has 4 divisors (see below), whose sum is σ = 25969632. Its totient is φ = 19477212.

The previous prime is 22723417. The next prime is 22723429. The reversal of 22723421 is 12432722.

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 22723421 - 2² = 22723417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22723429) 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, 1623095 + ... + 1623108.

It is an arithmetic number, because the mean of its divisors is an integer number (6492408).

Almost surely, 2^22723421 is an apocalyptic number.

It is an amenable number.

22723421 is a deficient number, since it is larger than the sum of its proper divisors (3246211).

22723421 is an equidigital number, since it uses as much as digits as its factorization.

22723421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3246210.

The product of its digits is 1344, while the sum is 23.

The square root of 22723421 is about 4766.9089565462. The cubic root of 22723421 is about 283.2421647469.

The spelling of 22723421 in words is "twenty-two million, seven hundred twenty-three thousand, four hundred twenty-one".