21113468415 has 48 divisors (see below), whose sum is σ = 40770868320. Its totient is φ = 10035889920.

The previous prime is 21113468407. The next prime is 21113468521. The reversal of 21113468415 is 51486431112.

It is not a de Polignac number, because 21113468415 - 2³ = 21113468407 is a prime.

It is a super-2 number, since 2×21113468415² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21113468415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 605301 + ... + 639230.

It is an arithmetic number, because the mean of its divisors is an integer number (849393090).

Almost surely, 2^21113468415 is an apocalyptic number.

21113468415 is a deficient number, since it is larger than the sum of its proper divisors (19657399905).

21113468415 is a wasteful number, since it uses less digits than its factorization.

21113468415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244584 (or 1244581 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

Adding to 21113468415 its reverse (51486431112), we get a palindrome (72599899527).

The spelling of 21113468415 in words is "twenty-one billion, one hundred thirteen million, four hundred sixty-eight thousand, four hundred fifteen".