21022413 has 4 divisors (see below), whose sum is σ = 28029888. Its totient is φ = 14014940.

The previous prime is 21022411. The next prime is 21022427. The reversal of 21022413 is 31422012.

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 21022413 - 2¹ = 21022411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21022392 and 21022401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503733 + ... + 3503738.

It is an arithmetic number, because the mean of its divisors is an integer number (7007472).

Almost surely, 2^21022413 is an apocalyptic number.

It is an amenable number.

21022413 is a deficient number, since it is larger than the sum of its proper divisors (7007475).

21022413 is an equidigital number, since it uses as much as digits as its factorization.

21022413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007474.

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

The square root of 21022413 is about 4585.0205015899. The cubic root of 21022413 is about 275.9905347521.

Adding to 21022413 its reverse (31422012), we get a palindrome (52444425).

The spelling of 21022413 in words is "twenty-one million, twenty-two thousand, four hundred thirteen".