21525253430 has 8 divisors (see below), whose sum is σ = 38745456192. Its totient is φ = 8610101368.

The previous prime is 21525253423. The next prime is 21525253439. The reversal of 21525253430 is 3435252512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525253439) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1076262662 + ... + 1076262681.

It is an arithmetic number, because the mean of its divisors is an integer number (4843182024).

Almost surely, 2^21525253430 is an apocalyptic number.

21525253430 is a deficient number, since it is larger than the sum of its proper divisors (17220202762).

21525253430 is a wasteful number, since it uses less digits than its factorization.

21525253430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152525350.

The product of its (nonzero) digits is 36000, while the sum is 32.

The spelling of 21525253430 in words is "twenty-one billion, five hundred twenty-five million, two hundred fifty-three thousand, four hundred thirty".