21413143 has 2 divisors, whose sum is σ = 21413144. Its totient is φ = 21413142.

The previous prime is 21413141. The next prime is 21413167. The reversal of 21413143 is 34131412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21413143 - 2¹ = 21413141 is a prime.

Together with 21413141, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21413143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21413141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706571 + 10706572.

It is an arithmetic number, because the mean of its divisors is an integer number (10706572).

Almost surely, 2^21413143 is an apocalyptic number.

21413143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21413143 is an equidigital number, since it uses as much as digits as its factorization.

21413143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 21413143 is about 4627.4337380453. The cubic root of 21413143 is about 277.6899351693.

Adding to 21413143 its reverse (34131412), we get a palindrome (55544555).

The spelling of 21413143 in words is "twenty-one million, four hundred thirteen thousand, one hundred forty-three".