11213643 has 16 divisors (see below), whose sum is σ = 17136896. Its totient is φ = 6389280.

The previous prime is 11213639. The next prime is 11213647. The reversal of 11213643 is 34631211.

It is an interprime number because it is at equal distance from previous prime (11213639) and next prime (11213647).

It is not a de Polignac number, because 11213643 - 2² = 11213639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (11213647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10473 + ... + 11493.

It is an arithmetic number, because the mean of its divisors is an integer number (1071056).

Almost surely, 2^11213643 is an apocalyptic number.

11213643 is a deficient number, since it is larger than the sum of its proper divisors (5923253).

11213643 is a wasteful number, since it uses less digits than its factorization.

11213643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554.

The product of its digits is 432, while the sum is 21.

The square root of 11213643 is about 3348.6777987737. The cubic root of 11213643 is about 223.8285984181.

Adding to 11213643 its reverse (34631211), we get a palindrome (45844854).

The spelling of 11213643 in words is "eleven million, two hundred thirteen thousand, six hundred forty-three".