21525403210 has 32 divisors (see below), whose sum is σ = 39000310272. Its totient is φ = 8553648000.

The previous prime is 21525403187. The next prime is 21525403253. The reversal of 21525403210 is 1230452512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4528335 + ... + 4533085.

It is an arithmetic number, because the mean of its divisors is an integer number (1218759696).

Almost surely, 2^21525403210 is an apocalyptic number.

21525403210 is a deficient number, since it is larger than the sum of its proper divisors (17474907062).

21525403210 is a wasteful number, since it uses less digits than its factorization.

21525403210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7638.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21525403210 its reverse (1230452512), we get a palindrome (22755855722).

The spelling of 21525403210 in words is "twenty-one billion, five hundred twenty-five million, four hundred three thousand, two hundred ten".