21182113 has 4 divisors (see below), whose sum is σ = 21309120. Its totient is φ = 21055108.

The previous prime is 21182111. The next prime is 21182143. The reversal of 21182113 is 31128112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21182113 - 2¹ = 21182111 is a prime.

It is a super-2 number, since 2×21182113² = 897363822289538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21182111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63253 + ... + 63586.

It is an arithmetic number, because the mean of its divisors is an integer number (5327280).

Almost surely, 2^21182113 is an apocalyptic number.

It is an amenable number.

21182113 is a deficient number, since it is larger than the sum of its proper divisors (127007).

21182113 is a wasteful number, since it uses less digits than its factorization.

21182113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127006.

The product of its digits is 96, while the sum is 19.

The square root of 21182113 is about 4602.4029593246. The cubic root of 21182113 is about 276.6876407060.

The spelling of 21182113 in words is "twenty-one million, one hundred eighty-two thousand, one hundred thirteen".