21532003225 has 48 divisors (see below), whose sum is σ = 28817762688. Its totient is φ = 15901424640.

The previous prime is 21532003189. The next prime is 21532003249. The reversal of 21532003225 is 52230023512.

It is not a de Polignac number, because 21532003225 - 2¹¹ = 21532001177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21532003225.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4681627 + ... + 4686223.

It is an arithmetic number, because the mean of its divisors is an integer number (600370056).

Almost surely, 2^21532003225 is an apocalyptic number.

21532003225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21532003225 is a deficient number, since it is larger than the sum of its proper divisors (7285759463).

21532003225 is a wasteful number, since it uses less digits than its factorization.

21532003225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4834 (or 4829 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21532003225 its reverse (52230023512), we get a palindrome (73762026737).

The spelling of 21532003225 in words is "twenty-one billion, five hundred thirty-two million, three thousand, two hundred twenty-five".