21155113413 has 32 divisors (see below), whose sum is σ = 35833939200. Its totient is φ = 12083318208.

The previous prime is 21155113393. The next prime is 21155113417. The reversal of 21155113413 is 31431155112.

21155113413 is a `hidden beast` number, since 2 + 115 + 511 + 34 + 1 + 3 = 666.

It is not a de Polignac number, because 21155113413 - 2⁶ = 21155113349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155113417) 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 31 ways as a sum of consecutive naturals, for example, 428095 + ... + 474947.

It is an arithmetic number, because the mean of its divisors is an integer number (1119810600).

Almost surely, 2^21155113413 is an apocalyptic number.

It is an amenable number.

21155113413 is a deficient number, since it is larger than the sum of its proper divisors (14678825787).

21155113413 is a wasteful number, since it uses less digits than its factorization.

21155113413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49258 (or 49252 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

Adding to 21155113413 its reverse (31431155112), we get a palindrome (52586268525).

The spelling of 21155113413 in words is "twenty-one billion, one hundred fifty-five million, one hundred thirteen thousand, four hundred thirteen".