854387135721 has 12 divisors (see below), whose sum is σ = 1410416859072. Its totient is φ = 488221220376.

The previous prime is 854387135683. The next prime is 854387135731. The reversal of 854387135721 is 127531783458.

854387135721 is a `hidden beast` number, since 8 + 5 + 438 + 7 + 135 + 72 + 1 = 666.

It is not a de Polignac number, because 854387135721 - 2²¹ = 854385038569 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (854387135731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6780850221 + ... + 6780850346.

It is an arithmetic number, because the mean of its divisors is an integer number (117534738256).

Almost surely, 2^854387135721 is an apocalyptic number.

It is an amenable number.

854387135721 is a deficient number, since it is larger than the sum of its proper divisors (556029723351).

854387135721 is a wasteful number, since it uses less digits than its factorization.

854387135721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13561700580 (or 13561700577 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 854387135721 in words is "eight hundred fifty-four billion, three hundred eighty-seven million, one hundred thirty-five thousand, seven hundred twenty-one".