21342413 has 8 divisors (see below), whose sum is σ = 22353408. Its totient is φ = 20338384.

The previous prime is 21342407. The next prime is 21342421. The reversal of 21342413 is 31424312.

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

It is a cyclic number.

It is not a de Polignac number, because 21342413 - 2²⁰ = 20293837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5156 + ... + 8322.

It is an arithmetic number, because the mean of its divisors is an integer number (2794176).

Almost surely, 2^21342413 is an apocalyptic number.

21342413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21342413 is a deficient number, since it is larger than the sum of its proper divisors (1010995).

21342413 is a wasteful number, since it uses less digits than its factorization.

21342413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483.

The product of its digits is 576, while the sum is 20.

The square root of 21342413 is about 4619.7849517050. The cubic root of 21342413 is about 277.3838509673.

Adding to 21342413 its reverse (31424312), we get a palindrome (52766725).

The spelling of 21342413 in words is "twenty-one million, three hundred forty-two thousand, four hundred thirteen".