21614013 has 8 divisors (see below), whose sum is σ = 32020800. Its totient is φ = 14409324.

The previous prime is 21613981. The next prime is 21614017. The reversal of 21614013 is 31041612.

It is a happy number.

It is not a de Polignac number, because 21614013 - 2⁵ = 21613981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400233 + ... + 400286.

It is an arithmetic number, because the mean of its divisors is an integer number (4002600).

Almost surely, 2^21614013 is an apocalyptic number.

It is an amenable number.

21614013 is a deficient number, since it is larger than the sum of its proper divisors (10406787).

21614013 is an equidigital number, since it uses as much as digits as its factorization.

21614013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800528 (or 800522 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21614013 is about 4649.0873297885. The cubic root of 21614013 is about 278.5555416130. Note that the first 4 decimals are identical.

Adding to 21614013 its reverse (31041612), we get a palindrome (52655625).

It can be divided in two parts, 216140 and 13, that added together give a triangular number (216153 = T₆₅₇).

The spelling of 21614013 in words is "twenty-one million, six hundred fourteen thousand, thirteen".