21377875087 has 2 divisors, whose sum is σ = 21377875088. Its totient is φ = 21377875086.

The previous prime is 21377875039. The next prime is 21377875151. The reversal of 21377875087 is 78057877312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21377875087 - 2¹¹ = 21377873039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21377875487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688937543 + 10688937544.

It is an arithmetic number, because the mean of its divisors is an integer number (10688937544).

Almost surely, 2^21377875087 is an apocalyptic number.

21377875087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21377875087 is an equidigital number, since it uses as much as digits as its factorization.

21377875087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4609920, while the sum is 55.

The spelling of 21377875087 in words is "twenty-one billion, three hundred seventy-seven million, eight hundred seventy-five thousand, eighty-seven".