21343413 has 32 divisors (see below), whose sum is σ = 35988736. Its totient is φ = 10948608.

The previous prime is 21343373. The next prime is 21343429. The reversal of 21343413 is 31434312.

It is not a de Polignac number, because 21343413 - 2⁹ = 21342901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21343413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343463) 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, 9045 + ... + 11157.

It is an arithmetic number, because the mean of its divisors is an integer number (1124648).

Almost surely, 2^21343413 is an apocalyptic number.

It is an amenable number.

21343413 is a deficient number, since it is larger than the sum of its proper divisors (14645323).

21343413 is a wasteful number, since it uses less digits than its factorization.

21343413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173.

The product of its digits is 864, while the sum is 21.

The square root of 21343413 is about 4619.8931805833. The cubic root of 21343413 is about 277.3881831784.

Adding to 21343413 its reverse (31434312), we get a palindrome (52777725).

The spelling of 21343413 in words is "twenty-one million, three hundred forty-three thousand, four hundred thirteen".