21822971087 has 2 divisors, whose sum is σ = 21822971088. Its totient is φ = 21822971086.

The previous prime is 21822971041. The next prime is 21822971099. The reversal of 21822971087 is 78017922812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21822971087 - 2²⁶ = 21755862223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21822911087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911485543 + 10911485544.

It is an arithmetic number, because the mean of its divisors is an integer number (10911485544).

Almost surely, 2^21822971087 is an apocalyptic number.

21822971087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21822971087 is an equidigital number, since it uses as much as digits as its factorization.

21822971087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 21822971087 in words is "twenty-one billion, eight hundred twenty-two million, nine hundred seventy-one thousand, eighty-seven".