22190421 has 16 divisors (see below), whose sum is σ = 32500800. Its totient is φ = 13355520.

The previous prime is 22190401. The next prime is 22190447. The reversal of 22190421 is 12409122.

It is not a de Polignac number, because 22190421 - 2¹⁴ = 22174037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22190401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2661 + ... + 7173.

It is an arithmetic number, because the mean of its divisors is an integer number (2031300).

Almost surely, 2^22190421 is an apocalyptic number.

It is an amenable number.

22190421 is a deficient number, since it is larger than the sum of its proper divisors (10310379).

22190421 is a wasteful number, since it uses less digits than its factorization.

22190421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 22190421 is about 4710.6709713161. The cubic root of 22190421 is about 281.0100467949.

Adding to 22190421 its reverse (12409122), we get a palindrome (34599543).

The spelling of 22190421 in words is "twenty-two million, one hundred ninety thousand, four hundred twenty-one".