21082604247 has 48 divisors (see below), whose sum is σ = 32589749088. Its totient is φ = 13086904320.

The previous prime is 21082604239. The next prime is 21082604299. The reversal of 21082604247 is 74240628012.

21082604247 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 2 + 604 + 2 + 47 = 666.

It is not a de Polignac number, because 21082604247 - 2³ = 21082604239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082604227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15265497 + ... + 15266877.

It is an arithmetic number, because the mean of its divisors is an integer number (678953106).

Almost surely, 2^21082604247 is an apocalyptic number.

21082604247 is a deficient number, since it is larger than the sum of its proper divisors (11507144841).

21082604247 is a wasteful number, since it uses less digits than its factorization.

21082604247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400 (or 2397 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The spelling of 21082604247 in words is "twenty-one billion, eighty-two million, six hundred four thousand, two hundred forty-seven".