22819421 has 4 divisors (see below), whose sum is σ = 22841952. Its totient is φ = 22796892.

The previous prime is 22819403. The next prime is 22819451. The reversal of 22819421 is 12491822.

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 a de Polignac number, because none of the positive numbers 2^k-22819421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22819451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9671 + ... + 11796.

It is an arithmetic number, because the mean of its divisors is an integer number (5710488).

Almost surely, 2^22819421 is an apocalyptic number.

It is an amenable number.

22819421 is a deficient number, since it is larger than the sum of its proper divisors (22531).

22819421 is a wasteful number, since it uses less digits than its factorization.

22819421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22530.

The product of its digits is 2304, while the sum is 29.

The square root of 22819421 is about 4776.9677620851. The cubic root of 22819421 is about 283.6404769211.

The spelling of 22819421 in words is "twenty-two million, eight hundred nineteen thousand, four hundred twenty-one".