21133125413 has 4 divisors (see below), whose sum is σ = 21814839168. Its totient is φ = 20451411660.

The previous prime is 21133125401. The next prime is 21133125451. The reversal of 21133125413 is 31452133112.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133125413 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 (21133125473) 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 3 ways as a sum of consecutive naturals, for example, 340856831 + ... + 340856892.

It is an arithmetic number, because the mean of its divisors is an integer number (5453709792).

Almost surely, 2^21133125413 is an apocalyptic number.

It is an amenable number.

21133125413 is a deficient number, since it is larger than the sum of its proper divisors (681713755).

21133125413 is an equidigital number, since it uses as much as digits as its factorization.

21133125413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681713754.

The product of its digits is 2160, while the sum is 26.

Adding to 21133125413 its reverse (31452133112), we get a palindrome (52585258525).

The spelling of 21133125413 in words is "twenty-one billion, one hundred thirty-three million, one hundred twenty-five thousand, four hundred thirteen".