22780621 has 4 divisors (see below), whose sum is σ = 22993632. Its totient is φ = 22567612.

The previous prime is 22780607. The next prime is 22780627. The reversal of 22780621 is 12608722.

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-22780621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22780621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22780627) 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, 106345 + ... + 106558.

It is an arithmetic number, because the mean of its divisors is an integer number (5748408).

Almost surely, 2^22780621 is an apocalyptic number.

It is an amenable number.

22780621 is a deficient number, since it is larger than the sum of its proper divisors (213011).

22780621 is a wasteful number, since it uses less digits than its factorization.

22780621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213010.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 22780621 is about 4772.9048806780. The cubic root of 22780621 is about 283.4796271806.

The spelling of 22780621 in words is "twenty-two million, seven hundred eighty thousand, six hundred twenty-one".