22151322581 has 2 divisors, whose sum is σ = 22151322582. Its totient is φ = 22151322580.

The previous prime is 22151322569. The next prime is 22151322607. The reversal of 22151322581 is 18522315122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20867247025 + 1284075556 = 144455^2 + 35834^2 .

It is a cyclic number.

It is not a de Polignac number, because 22151322581 - 2¹⁴ = 22151306197 is a prime.

It is a super-2 number, since 2×22151322581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22151322511) 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, 11075661290 + 11075661291.

It is an arithmetic number, because the mean of its divisors is an integer number (11075661291).

Almost surely, 2^22151322581 is an apocalyptic number.

It is an amenable number.

22151322581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22151322581 is an equidigital number, since it uses as much as digits as its factorization.

22151322581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 32.

The spelling of 22151322581 in words is "twenty-two billion, one hundred fifty-one million, three hundred twenty-two thousand, five hundred eighty-one".