21130814 has 4 divisors (see below), whose sum is σ = 31696224. Its totient is φ = 10565406.

The previous prime is 21130801. The next prime is 21130817. The reversal of 21130814 is 41803112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21130814² = 893022600605192, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130817) 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 as a sum of consecutive naturals, namely, 5282702 + ... + 5282705.

It is an arithmetic number, because the mean of its divisors is an integer number (7924056).

Almost surely, 2^21130814 is an apocalyptic number.

21130814 is a deficient number, since it is larger than the sum of its proper divisors (10565410).

21130814 is a wasteful number, since it uses less digits than its factorization.

21130814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10565409.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21130814 is about 4596.8265140203. The cubic root of 21130814 is about 276.4640987497.

Adding to 21130814 its reverse (41803112), we get a palindrome (62933926).

The spelling of 21130814 in words is "twenty-one million, one hundred thirty thousand, eight hundred fourteen".