21859054287 has 16 divisors (see below), whose sum is σ = 34209280512. Its totient is φ = 12153296160.

The previous prime is 21859054277. The next prime is 21859054303. The reversal of 21859054287 is 78245095812.

It is not a de Polignac number, because 21859054287 - 2¹¹ = 21859052239 is a prime.

It is a super-3 number, since 3×21859054287³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21859054207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14065539 + ... + 14067092.

It is an arithmetic number, because the mean of its divisors is an integer number (2138080032).

Almost surely, 2^21859054287 is an apocalyptic number.

21859054287 is a deficient number, since it is larger than the sum of its proper divisors (12350226225).

21859054287 is a wasteful number, since it uses less digits than its factorization.

21859054287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28132678.

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 21859054287 in words is "twenty-one billion, eight hundred fifty-nine million, fifty-four thousand, two hundred eighty-seven".