21525034413 has 4 divisors (see below), whose sum is σ = 28700045888. Its totient is φ = 14350022940.

The previous prime is 21525034411. The next prime is 21525034417. The reversal of 21525034413 is 31443052512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21525034413 - 2¹ = 21525034411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525034411) 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, 3587505733 + ... + 3587505738.

It is an arithmetic number, because the mean of its divisors is an integer number (7175011472).

Almost surely, 2^21525034413 is an apocalyptic number.

It is an amenable number.

21525034413 is a deficient number, since it is larger than the sum of its proper divisors (7175011475).

21525034413 is an equidigital number, since it uses as much as digits as its factorization.

21525034413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175011474.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21525034413 its reverse (31443052512), we get a palindrome (52968086925).

The spelling of 21525034413 in words is "twenty-one billion, five hundred twenty-five million, thirty-four thousand, four hundred thirteen".