22307421 has 4 divisors (see below), whose sum is σ = 29743232. Its totient is φ = 14871612.

The previous prime is 22307407. The next prime is 22307429. The reversal of 22307421 is 12470322.

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 not a de Polignac number, because 22307421 - 2⁶ = 22307357 is a prime.

It is a super-3 number, since 3×22307421³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22307429) 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, 3717901 + ... + 3717906.

It is an arithmetic number, because the mean of its divisors is an integer number (7435808).

Almost surely, 2^22307421 is an apocalyptic number.

It is an amenable number.

22307421 is a deficient number, since it is larger than the sum of its proper divisors (7435811).

22307421 is an equidigital number, since it uses as much as digits as its factorization.

22307421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7435810.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 22307421 is about 4723.0732579540. The cubic root of 22307421 is about 281.5030607287.

Adding to 22307421 its reverse (12470322), we get a palindrome (34777743).

The spelling of 22307421 in words is "twenty-two million, three hundred seven thousand, four hundred twenty-one".