21356151871 has 2 divisors, whose sum is σ = 21356151872. Its totient is φ = 21356151870.

The previous prime is 21356151857. The next prime is 21356151877. The reversal of 21356151871 is 17815165312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21356151871 - 2⁷ = 21356151743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21356151877) 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, 10678075935 + 10678075936.

It is an arithmetic number, because the mean of its divisors is an integer number (10678075936).

Almost surely, 2^21356151871 is an apocalyptic number.

21356151871 is a deficient number, since it is larger than the sum of its proper divisors (1).

21356151871 is an equidigital number, since it uses as much as digits as its factorization.

21356151871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 40.

The spelling of 21356151871 in words is "twenty-one billion, three hundred fifty-six million, one hundred fifty-one thousand, eight hundred seventy-one".