21143411 has 2 divisors, whose sum is σ = 21143412. Its totient is φ = 21143410.

The previous prime is 21143383. The next prime is 21143453. The reversal of 21143411 is 11434112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21143411 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21143411.

It is not a weakly prime, because it can be changed into another prime (21143491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571705 + 10571706.

It is an arithmetic number, because the mean of its divisors is an integer number (10571706).

Almost surely, 2^21143411 is an apocalyptic number.

21143411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143411 is an equidigital number, since it uses as much as digits as its factorization.

21143411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 21143411 is about 4598.1964942790. The cubic root of 21143411 is about 276.5190252728.

Adding to 21143411 its reverse (11434112), we get a palindrome (32577523).

It can be divided in two parts, 2 and 1143411, that multiplied together give a palindrome (2286822).

The spelling of 21143411 in words is "twenty-one million, one hundred forty-three thousand, four hundred eleven".