22431421 has 4 divisors (see below), whose sum is σ = 22595292. Its totient is φ = 22267552.

The previous prime is 22431391. The next prime is 22431427. The reversal of 22431421 is 12413422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 5736025 = 4086^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 22431421 - 2⁹ = 22430909 is a prime.

It is a super-3 number, since 3×22431421³ (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 (22431427) 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, 81730 + ... + 82003.

It is an arithmetic number, because the mean of its divisors is an integer number (5648823).

Almost surely, 2^22431421 is an apocalyptic number.

It is an amenable number.

22431421 is a deficient number, since it is larger than the sum of its proper divisors (163871).

22431421 is a wasteful number, since it uses less digits than its factorization.

22431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163870.

The product of its digits is 384, while the sum is 19.

The square root of 22431421 is about 4736.1821122081. The cubic root of 22431421 is about 282.0236931621.

Adding to 22431421 its reverse (12413422), we get a palindrome (34844843).

The spelling of 22431421 in words is "twenty-two million, four hundred thirty-one thousand, four hundred twenty-one".