21115525422213 has 8 divisors (see below), whose sum is σ = 31282259884800. Its totient is φ = 14077016948124.

The previous prime is 21115525422209. The next prime is 21115525422221. The reversal of 21115525422213 is 31222452551112.

21115525422213 is a `hidden beast` number, since 2 + 1 + 1 + 15 + 5 + 2 + 5 + 422 + 213 = 666.

It is not a de Polignac number, because 21115525422213 - 2² = 21115525422209 is a prime.

It is a super-2 number, since 2×21115525422213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115525422283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391028248533 + ... + 391028248586.

It is an arithmetic number, because the mean of its divisors is an integer number (3910282485600).

Almost surely, 2^{21115525422213} is an apocalyptic number.

It is an amenable number.

21115525422213 is a deficient number, since it is larger than the sum of its proper divisors (10166734462587).

21115525422213 is an equidigital number, since it uses as much as digits as its factorization.

21115525422213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782056497128 (or 782056497122 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 21115525422213 its reverse (31222452551112), we get a palindrome (52337977973325).

The spelling of 21115525422213 in words is "twenty-one trillion, one hundred fifteen billion, five hundred twenty-five million, four hundred twenty-two thousand, two hundred thirteen".