22756421 has 8 divisors (see below), whose sum is σ = 24136704. Its totient is φ = 21380800.

The previous prime is 22756373. The next prime is 22756427. The reversal of 22756421 is 12465722.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22756421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22756427) 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 7 ways as a sum of consecutive naturals, for example, 18986 + ... + 20148.

It is an arithmetic number, because the mean of its divisors is an integer number (3017088).

Almost surely, 2^22756421 is an apocalyptic number.

It is an amenable number.

22756421 is a deficient number, since it is larger than the sum of its proper divisors (1380283).

22756421 is a wasteful number, since it uses less digits than its factorization.

22756421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331.

The product of its digits is 6720, while the sum is 29.

The square root of 22756421 is about 4770.3690632906. The cubic root of 22756421 is about 283.3792108717.

The spelling of 22756421 in words is "twenty-two million, seven hundred fifty-six thousand, four hundred twenty-one".