22540210921 has 2 divisors, whose sum is σ = 22540210922. Its totient is φ = 22540210920.

The previous prime is 22540210873. The next prime is 22540210993. The reversal of 22540210921 is 12901204522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12620050921 + 9920160000 = 112339^2 + 99600^2 .

It is a cyclic number.

It is not a de Polignac number, because 22540210921 - 2⁹ = 22540210409 is a prime.

It is a super-2 number, since 2×22540210921² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22540210921.

It is not a weakly prime, because it can be changed into another prime (22540213921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11270105460 + 11270105461.

It is an arithmetic number, because the mean of its divisors is an integer number (11270105461).

Almost surely, 2^22540210921 is an apocalyptic number.

It is an amenable number.

22540210921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22540210921 is an equidigital number, since it uses as much as digits as its factorization.

22540210921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 22540210921 in words is "twenty-two billion, five hundred forty million, two hundred ten thousand, nine hundred twenty-one".