21525022013 has 16 divisors (see below), whose sum is σ = 23665763520. Its totient is φ = 19415088000.

The previous prime is 21525022009. The next prime is 21525022033. The reversal of 21525022013 is 31022052512.

It is not a de Polignac number, because 21525022013 - 2² = 21525022009 is a prime.

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 21525022013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525022033) 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 15 ways as a sum of consecutive naturals, for example, 5587538 + ... + 5591388.

It is an arithmetic number, because the mean of its divisors is an integer number (1479110220).

Almost surely, 2^21525022013 is an apocalyptic number.

It is an amenable number.

21525022013 is a deficient number, since it is larger than the sum of its proper divisors (2140741507).

21525022013 is a wasteful number, since it uses less digits than its factorization.

21525022013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7708.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21525022013 its reverse (31022052512), we get a palindrome (52547074525).

The spelling of 21525022013 in words is "twenty-one billion, five hundred twenty-five million, twenty-two thousand, thirteen".