22400421 has 4 divisors (see below), whose sum is σ = 29867232. Its totient is φ = 14933612.

The previous prime is 22400419. The next prime is 22400423. The reversal of 22400421 is 12400422.

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 an interprime number because it is at equal distance from previous prime (22400419) and next prime (22400423).

It is a cyclic number.

It is not a de Polignac number, because 22400421 - 2¹ = 22400419 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22400423) 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, 3733401 + ... + 3733406.

It is an arithmetic number, because the mean of its divisors is an integer number (7466808).

Almost surely, 2^22400421 is an apocalyptic number.

It is an amenable number.

22400421 is a deficient number, since it is larger than the sum of its proper divisors (7466811).

22400421 is an equidigital number, since it uses as much as digits as its factorization.

22400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7466810.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22400421 is about 4732.9083025134. The cubic root of 22400421 is about 281.8937152910.

Adding to 22400421 its reverse (12400422), we get a palindrome (34800843).

Subtracting from 22400421 its reverse (12400422), we obtain a palindrome (9999999).

The spelling of 22400421 in words is "twenty-two million, four hundred thousand, four hundred twenty-one".