21032313 has 8 divisors (see below), whose sum is σ = 28300800. Its totient is φ = 13892688.

The previous prime is 21032309. The next prime is 21032329. The reversal of 21032313 is 31323012.

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

It is not a de Polignac number, because 21032313 - 2² = 21032309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21032292 and 21032301.

It is not an unprimeable number, because it can be changed into a prime (21032513) 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, 31833 + ... + 32486.

It is an arithmetic number, because the mean of its divisors is an integer number (3537600).

Almost surely, 2^21032313 is an apocalyptic number.

It is an amenable number.

21032313 is a deficient number, since it is larger than the sum of its proper divisors (7268487).

21032313 is a wasteful number, since it uses less digits than its factorization.

21032313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64431.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21032313 is about 4586.0999771047. The cubic root of 21032313 is about 276.0338516555.

Adding to 21032313 its reverse (31323012), we get a palindrome (52355325).

It can be divided in two parts, 210 and 32313, that added together give a palindrome (32523).

The spelling of 21032313 in words is "twenty-one million, thirty-two thousand, three hundred thirteen".