21888886837 has 2 divisors, whose sum is σ = 21888886838. Its totient is φ = 21888886836.

The previous prime is 21888886823. The next prime is 21888886841. The reversal of 21888886837 is 73868888812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21406908721 + 481978116 = 146311^2 + 21954^2 .

It is a cyclic number.

It is not a de Polignac number, because 21888886837 - 2²⁷ = 21754669109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21888886337) 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, 10944443418 + 10944443419.

It is an arithmetic number, because the mean of its divisors is an integer number (10944443419).

Almost surely, 2^21888886837 is an apocalyptic number.

It is an amenable number.

21888886837 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888886837 is an equidigital number, since it uses as much as digits as its factorization.

21888886837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66060288, while the sum is 67.

The spelling of 21888886837 in words is "twenty-one billion, eight hundred eighty-eight million, eight hundred eighty-six thousand, eight hundred thirty-seven".