21087482355 has 16 divisors (see below), whose sum is σ = 37488857760. Its totient is φ = 11246657184.

The previous prime is 21087482347. The next prime is 21087482359. The reversal of 21087482355 is 55328478012.

21087482355 is a `hidden beast` number, since 210 + 8 + 7 + 4 + 82 + 355 = 666.

It is not a de Polignac number, because 21087482355 - 2³ = 21087482347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21087482355.

It is not an unprimeable number, because it can be changed into a prime (21087482359) 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, 78101652 + ... + 78101921.

It is an arithmetic number, because the mean of its divisors is an integer number (2343053610).

Almost surely, 2^21087482355 is an apocalyptic number.

21087482355 is a deficient number, since it is larger than the sum of its proper divisors (16401375405).

21087482355 is a wasteful number, since it uses less digits than its factorization.

21087482355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156203587 (or 156203581 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 21087482355 in words is "twenty-one billion, eighty-seven million, four hundred eighty-two thousand, three hundred fifty-five".