21526005240 has 48 divisors (see below), whose sum is σ = 69959518200. Its totient is φ = 5740267968.

The previous prime is 21526005199. The next prime is 21526005271. The reversal of 21526005240 is 4250062512.

21526005240 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 600 + 52 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29896870 + ... + 29897589.

Almost surely, 2^21526005240 is an apocalyptic number.

21526005240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21526005240 is an abundant number, since it is smaller than the sum of its proper divisors (48433512960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21526005240 is a wasteful number, since it uses less digits than its factorization.

21526005240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59794476 (or 59794469 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21526005240 its reverse (4250062512), we get a palindrome (25776067752).

The spelling of 21526005240 in words is "twenty-one billion, five hundred twenty-six million, five thousand, two hundred forty".