22505363021 has 4 divisors (see below), whose sum is σ = 22517380572. Its totient is φ = 22493345472.

The previous prime is 22505363003. The next prime is 22505363039. The reversal of 22505363021 is 12036350522.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (22505363003) and next prime (22505363039).

It can be written as a sum of positive squares in 2 ways, for example, as 10973610025 + 11531752996 = 104755^2 + 107386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22505363021 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 (22505363071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6005966 + ... + 6009711.

It is an arithmetic number, because the mean of its divisors is an integer number (5629345143).

Almost surely, 2^22505363021 is an apocalyptic number.

It is an amenable number.

22505363021 is a deficient number, since it is larger than the sum of its proper divisors (12017551).

22505363021 is a wasteful number, since it uses less digits than its factorization.

22505363021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12017550.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 22505363021 in words is "twenty-two billion, five hundred five million, three hundred sixty-three thousand, twenty-one".