21113376 has 24 divisors (see below), whose sum is σ = 55422864. Its totient is φ = 7037760.

The previous prime is 21113357. The next prime is 21113399. The reversal of 21113376 is 67331112.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21113376² = 891549292234752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109870 + ... + 110061.

It is an arithmetic number, because the mean of its divisors is an integer number (2309286).

Almost surely, 2^21113376 is an apocalyptic number.

It is an amenable number.

21113376 is an abundant number, since it is smaller than the sum of its proper divisors (34309488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113376 is a wasteful number, since it uses less digits than its factorization.

21113376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219944 (or 219936 counting only the distinct ones).

The product of its digits is 756, while the sum is 24.

The square root of 21113376 is about 4594.9293792179. The cubic root of 21113376 is about 276.3880280452.

Adding to 21113376 its reverse (67331112), we get a palindrome (88444488).

The spelling of 21113376 in words is "twenty-one million, one hundred thirteen thousand, three hundred seventy-six".