21525501203 has 4 divisors (see below), whose sum is σ = 21545304960. Its totient is φ = 21505697448.

The previous prime is 21525501131. The next prime is 21525501259. The reversal of 21525501203 is 30210552512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21525501203 - 2²⁰ = 21524452627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21525501293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9900248 + ... + 9902421.

It is an arithmetic number, because the mean of its divisors is an integer number (5386326240).

Almost surely, 2^21525501203 is an apocalyptic number.

21525501203 is a deficient number, since it is larger than the sum of its proper divisors (19803757).

21525501203 is a wasteful number, since it uses less digits than its factorization.

21525501203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19803756.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21525501203 in words is "twenty-one billion, five hundred twenty-five million, five hundred one thousand, two hundred three".