21277334587 has 2 divisors, whose sum is σ = 21277334588. Its totient is φ = 21277334586.

The previous prime is 21277334581. The next prime is 21277334641. The reversal of 21277334587 is 78543377212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21277334587 - 2¹¹ = 21277332539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21277334587.

It is not a weakly prime, because it can be changed into another prime (21277334581) 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, 10638667293 + 10638667294.

It is an arithmetic number, because the mean of its divisors is an integer number (10638667294).

Almost surely, 2^21277334587 is an apocalyptic number.

21277334587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21277334587 is an equidigital number, since it uses as much as digits as its factorization.

21277334587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 49.

The spelling of 21277334587 in words is "twenty-one billion, two hundred seventy-seven million, three hundred thirty-four thousand, five hundred eighty-seven".