22290421 has 4 divisors (see below), whose sum is σ = 22308832. Its totient is φ = 22272012.

The previous prime is 22290419. The next prime is 22290449. The reversal of 22290421 is 12409222.

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 a cyclic number.

It is not a de Polignac number, because 22290421 - 2¹ = 22290419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22290392 and 22290401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22290461) 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, 7251 + ... + 9856.

It is an arithmetic number, because the mean of its divisors is an integer number (5577208).

Almost surely, 2^22290421 is an apocalyptic number.

It is an amenable number.

22290421 is a deficient number, since it is larger than the sum of its proper divisors (18411).

22290421 is a wasteful number, since it uses less digits than its factorization.

22290421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18410.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22290421 is about 4721.2732392862. The cubic root of 22290421 is about 281.4315334374.

Adding to 22290421 its reverse (12409222), we get a palindrome (34699643).

The spelling of 22290421 in words is "twenty-two million, two hundred ninety thousand, four hundred twenty-one".