21525110213 has 8 divisors (see below), whose sum is σ = 21730429656. Its totient is φ = 21320051200.

The previous prime is 21525110153. The next prime is 21525110227. The reversal of 21525110213 is 31201152512.

It can be written as a sum of positive squares in 4 ways, for example, as 898980289 + 20626129924 = 29983^2 + 143618^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21525110213 - 2¹⁴ = 21525093829 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 (21525190213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103043 + ... + 231663.

It is an arithmetic number, because the mean of its divisors is an integer number (2716303707).

Almost surely, 2^21525110213 is an apocalyptic number.

It is an amenable number.

21525110213 is a deficient number, since it is larger than the sum of its proper divisors (205319443).

21525110213 is a wasteful number, since it uses less digits than its factorization.

21525110213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130215.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21525110213 its reverse (31201152512), we get a palindrome (52726262725).

The spelling of 21525110213 in words is "twenty-one billion, five hundred twenty-five million, one hundred ten thousand, two hundred thirteen".