22521977813 has 2 divisors, whose sum is σ = 22521977814. Its totient is φ = 22521977812.

The previous prime is 22521977801. The next prime is 22521977831. The reversal of 22521977813 is 31877912522.

It is a happy number.

Together with next prime (22521977831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19045932049 + 3476045764 = 138007^2 + 58958^2 .

It is a cyclic number.

It is not a de Polignac number, because 22521977813 - 2⁸ = 22521977557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22521977113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11260988906 + 11260988907.

It is an arithmetic number, because the mean of its divisors is an integer number (11260988907).

Almost surely, 2^22521977813 is an apocalyptic number.

It is an amenable number.

22521977813 is a deficient number, since it is larger than the sum of its proper divisors (1).

22521977813 is an equidigital number, since it uses as much as digits as its factorization.

22521977813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The spelling of 22521977813 in words is "twenty-two billion, five hundred twenty-one million, nine hundred seventy-seven thousand, eight hundred thirteen".