21893568887 has 2 divisors, whose sum is σ = 21893568888. Its totient is φ = 21893568886.

The previous prime is 21893568839. The next prime is 21893568899. The reversal of 21893568887 is 78886539812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21893568887 - 2²⁶ = 21826460023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21893508887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946784443 + 10946784444.

It is an arithmetic number, because the mean of its divisors is an integer number (10946784444).

Almost surely, 2^21893568887 is an apocalyptic number.

21893568887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21893568887 is an equidigital number, since it uses as much as digits as its factorization.

21893568887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46448640, while the sum is 65.

The spelling of 21893568887 in words is "twenty-one billion, eight hundred ninety-three million, five hundred sixty-eight thousand, eight hundred eighty-seven".