21202413 has 4 divisors (see below), whose sum is σ = 28269888. Its totient is φ = 14134940.

The previous prime is 21202409. The next prime is 21202421. The reversal of 21202413 is 31420212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21202413 - 2² = 21202409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202392 and 21202401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202403) 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 3 ways as a sum of consecutive naturals, for example, 3533733 + ... + 3533738.

It is an arithmetic number, because the mean of its divisors is an integer number (7067472).

Almost surely, 2^21202413 is an apocalyptic number.

It is an amenable number.

21202413 is a deficient number, since it is larger than the sum of its proper divisors (7067475).

21202413 is an equidigital number, since it uses as much as digits as its factorization.

21202413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067474.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21202413 is about 4604.6078008881. The cubic root of 21202413 is about 276.7760008832.

Adding to 21202413 its reverse (31420212), we get a palindrome (52622625).

The spelling of 21202413 in words is "twenty-one million, two hundred two thousand, four hundred thirteen".