22145504021 has 2 divisors, whose sum is σ = 22145504022. Its totient is φ = 22145504020.

The previous prime is 22145503999. The next prime is 22145504057. The reversal of 22145504021 is 12040554122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16872711025 + 5272792996 = 129895^2 + 72614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22145504021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22145504081) 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 as a sum of consecutive naturals, namely, 11072752010 + 11072752011.

It is an arithmetic number, because the mean of its divisors is an integer number (11072752011).

Almost surely, 2^22145504021 is an apocalyptic number.

It is an amenable number.

22145504021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22145504021 is an equidigital number, since it uses as much as digits as its factorization.

22145504021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 22145504021 in words is "twenty-two billion, one hundred forty-five million, five hundred four thousand, twenty-one".