21872886551 has 2 divisors, whose sum is σ = 21872886552. Its totient is φ = 21872886550.

The previous prime is 21872886509. The next prime is 21872886661. The reversal of 21872886551 is 15568827812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21872886551 - 2¹⁰ = 21872885527 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21872886493 and 21872886502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21872886151) 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, 10936443275 + 10936443276.

It is an arithmetic number, because the mean of its divisors is an integer number (10936443276).

Almost surely, 2^21872886551 is an apocalyptic number.

21872886551 is a deficient number, since it is larger than the sum of its proper divisors (1).

21872886551 is an equidigital number, since it uses as much as digits as its factorization.

21872886551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2150400, while the sum is 53.

The spelling of 21872886551 in words is "twenty-one billion, eight hundred seventy-two million, eight hundred eighty-six thousand, five hundred fifty-one".