21412311 has 4 divisors (see below), whose sum is σ = 28549752. Its totient is φ = 14274872.

The previous prime is 21412309. The next prime is 21412319. The reversal of 21412311 is 11321412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21412311 - 2¹ = 21412309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3568716 + ... + 3568721.

It is an arithmetic number, because the mean of its divisors is an integer number (7137438).

Almost surely, 2^21412311 is an apocalyptic number.

21412311 is a deficient number, since it is larger than the sum of its proper divisors (7137441).

21412311 is an equidigital number, since it uses as much as digits as its factorization.

21412311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137440.

The product of its digits is 48, while the sum is 15.

The square root of 21412311 is about 4627.3438385320. The cubic root of 21412311 is about 277.6863386084.

Adding to 21412311 its reverse (11321412), we get a palindrome (32733723).

The spelling of 21412311 in words is "twenty-one million, four hundred twelve thousand, three hundred eleven".