21143363 has 2 divisors, whose sum is σ = 21143364. Its totient is φ = 21143362.

The previous prime is 21143357. The next prime is 21143377. The reversal of 21143363 is 36334112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21143363 - 2²⁰ = 20094787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21143383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571681 + 10571682.

It is an arithmetic number, because the mean of its divisors is an integer number (10571682).

Almost surely, 2^21143363 is an apocalyptic number.

21143363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143363 is an equidigital number, since it uses as much as digits as its factorization.

21143363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

The square root of 21143363 is about 4598.1912748384. The cubic root of 21143363 is about 276.5188160205.

Adding to 21143363 its reverse (36334112), we get a palindrome (57477475).

The spelling of 21143363 in words is "twenty-one million, one hundred forty-three thousand, three hundred sixty-three".