21232713 has 8 divisors (see below), whose sum is σ = 28370368. Its totient is φ = 14125104.

The previous prime is 21232699. The next prime is 21232723. The reversal of 21232713 is 31723212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21232713 - 2⁵ = 21232681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21232713.

It is not an unprimeable number, because it can be changed into a prime (21232723) 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 7 ways as a sum of consecutive naturals, for example, 5806 + ... + 8727.

It is an arithmetic number, because the mean of its divisors is an integer number (3546296).

Almost surely, 2^21232713 is an apocalyptic number.

It is an amenable number.

21232713 is a deficient number, since it is larger than the sum of its proper divisors (7137655).

21232713 is a wasteful number, since it uses less digits than its factorization.

21232713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15023.

The product of its digits is 504, while the sum is 21.

The square root of 21232713 is about 4607.8968087404. The cubic root of 21232713 is about 276.9077833850.

Adding to 21232713 its reverse (31723212), we get a palindrome (52955925).

It can be divided in two parts, 21232 and 713, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 21232713 in words is "twenty-one million, two hundred thirty-two thousand, seven hundred thirteen".