21322413 has 32 divisors (see below), whose sum is σ = 36491520. Its totient is φ = 12052800.

The previous prime is 21322391. The next prime is 21322417. The reversal of 21322413 is 31422312.

It is not a de Polignac number, because 21322413 - 2⁵ = 21322381 is a prime.

It is a super-2 number, since 2×21322413² = 909290592285138, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322417) 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 31 ways as a sum of consecutive naturals, for example, 18531 + ... + 19647.

It is an arithmetic number, because the mean of its divisors is an integer number (1140360).

Almost surely, 2^21322413 is an apocalyptic number.

It is an amenable number.

21322413 is a deficient number, since it is larger than the sum of its proper divisors (15169107).

21322413 is a wasteful number, since it uses less digits than its factorization.

21322413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234 (or 1228 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21322413 is about 4617.6198414335. The cubic root of 21322413 is about 277.2971783117.

Adding to 21322413 its reverse (31422312), we get a palindrome (52744725).

The spelling of 21322413 in words is "twenty-one million, three hundred twenty-two thousand, four hundred thirteen".