23221404 has 30 divisors (see below), whose sum is σ = 60706184. Its totient is φ = 7740360.

The previous prime is 23221391. The next prime is 23221411. The reversal of 23221404 is 40412232.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 35512 + ... + 36159.

Almost surely, 2^23221404 is an apocalyptic number.

It is an amenable number.

23221404 is an abundant number, since it is smaller than the sum of its proper divisors (37484780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23221404 is a wasteful number, since it uses less digits than its factorization.

23221404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71687 (or 71676 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 23221404 is about 4818.8592010973. The cubic root of 23221404 is about 285.2963123182.

Adding to 23221404 its reverse (40412232), we get a palindrome (63633636).

The spelling of 23221404 in words is "twenty-three million, two hundred twenty-one thousand, four hundred four".