21320041525 has 48 divisors (see below), whose sum is σ = 28091916288. Its totient is φ = 16027704000.

The previous prime is 21320041507. The next prime is 21320041529. The reversal of 21320041525 is 52514002312.

It is not a de Polignac number, because 21320041525 - 2¹⁵ = 21320008757 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21320041525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320041529) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3683784 + ... + 3689566.

It is an arithmetic number, because the mean of its divisors is an integer number (585248256).

Almost surely, 2^21320041525 is an apocalyptic number.

21320041525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21320041525 is a deficient number, since it is larger than the sum of its proper divisors (6771874763).

21320041525 is a wasteful number, since it uses less digits than its factorization.

21320041525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5962 (or 5957 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21320041525 its reverse (52514002312), we get a palindrome (73834043837).

The spelling of 21320041525 in words is "twenty-one billion, three hundred twenty million, forty-one thousand, five hundred twenty-five".