21377875487 has 2 divisors, whose sum is σ = 21377875488. Its totient is φ = 21377875486.

The previous prime is 21377875483. The next prime is 21377875489. The reversal of 21377875487 is 78457877312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21377875487 - 2² = 21377875483 is a prime.

Together with 21377875489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21377875483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688937743 + 10688937744.

It is an arithmetic number, because the mean of its divisors is an integer number (10688937744).

Almost surely, 2^21377875487 is an apocalyptic number.

21377875487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21377875487 is an equidigital number, since it uses as much as digits as its factorization.

21377875487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18439680, while the sum is 59.

The spelling of 21377875487 in words is "twenty-one billion, three hundred seventy-seven million, eight hundred seventy-five thousand, four hundred eighty-seven".