22709421 has 24 divisors (see below), whose sum is σ = 38024064. Its totient is φ = 12791520.

The previous prime is 22709417. The next prime is 22709429. The reversal of 22709421 is 12490722.

It is not a de Polignac number, because 22709421 - 2² = 22709417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22709429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1935 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (1584336).

Almost surely, 2^22709421 is an apocalyptic number.

22709421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22709421 is a deficient number, since it is larger than the sum of its proper divisors (15314643).

22709421 is a wasteful number, since it uses less digits than its factorization.

22709421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5161 (or 5158 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 22709421 is about 4765.4402734690. The cubic root of 22709421 is about 283.1839838807.

The spelling of 22709421 in words is "twenty-two million, seven hundred nine thousand, four hundred twenty-one".