21113203401525 has 144 divisors (see below), whose sum is σ = 36224781465600. Its totient is φ = 10843615641600.

The previous prime is 21113203401523. The next prime is 21113203401553. The reversal of 21113203401525 is 52510430231112.

It is a happy number.

It is not a de Polignac number, because 21113203401525 - 2¹ = 21113203401523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21113203401492 and 21113203401501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113203401523) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 47022724501 + ... + 47022724949.

It is an arithmetic number, because the mean of its divisors is an integer number (251560982400).

Almost surely, 2^{21113203401525} is an apocalyptic number.

21113203401525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21113203401525 is a deficient number, since it is larger than the sum of its proper divisors (15111578064075).

21113203401525 is a wasteful number, since it uses less digits than its factorization.

21113203401525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21113203401525 its reverse (52510430231112), we get a palindrome (73623633632637).

The spelling of 21113203401525 in words is "twenty-one trillion, one hundred thirteen billion, two hundred three million, four hundred one thousand, five hundred twenty-five".