21525003535240 has 64 divisors (see below), whose sum is σ = 48646610510400. Its totient is φ = 8571719639808.

The previous prime is 21525003535223. The next prime is 21525003535261. The reversal of 21525003535240 is 4253530052512.

It is a self number, because there is not a number n which added to its sum of digits gives 21525003535240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429813082 + ... + 429863158.

It is an arithmetic number, because the mean of its divisors is an integer number (760103289225).

Almost surely, 2^{21525003535240} is an apocalyptic number.

21525003535240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525003535240 is an abundant number, since it is smaller than the sum of its proper divisors (27121606975160).

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

21525003535240 is a wasteful number, since it uses less digits than its factorization.

21525003535240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97654 (or 97650 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 37.

Adding to 21525003535240 its reverse (4253530052512), we get a palindrome (25778533587752).

The spelling of 21525003535240 in words is "twenty-one trillion, five hundred twenty-five billion, three million, five hundred thirty-five thousand, two hundred forty".