21125114413 has 48 divisors (see below), whose sum is σ = 26120102400. Its totient is φ = 16961218560.

The previous prime is 21125114407. The next prime is 21125114419. The reversal of 21125114413 is 31441152112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21125114407) and next prime (21125114419).

It is a de Polignac number, because none of the positive numbers 2^k-21125114413 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 (21125114419) 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 47 ways as a sum of consecutive naturals, for example, 2233348 + ... + 2242786.

It is an arithmetic number, because the mean of its divisors is an integer number (544168800).

Almost surely, 2^21125114413 is an apocalyptic number.

It is an amenable number.

21125114413 is a deficient number, since it is larger than the sum of its proper divisors (4994987987).

21125114413 is a wasteful number, since it uses less digits than its factorization.

21125114413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9542 (or 9529 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

Adding to 21125114413 its reverse (31441152112), we get a palindrome (52566266525).

The spelling of 21125114413 in words is "twenty-one billion, one hundred twenty-five million, one hundred fourteen thousand, four hundred thirteen".