21383143 has 2 divisors, whose sum is σ = 21383144. Its totient is φ = 21383142.

The previous prime is 21383137. The next prime is 21383177. The reversal of 21383143 is 34138312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21383143 - 2⁵ = 21383111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21383183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691571 + 10691572.

It is an arithmetic number, because the mean of its divisors is an integer number (10691572).

Almost surely, 2^21383143 is an apocalyptic number.

21383143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21383143 is an equidigital number, since it uses as much as digits as its factorization.

21383143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 21383143 is about 4624.1910643917. The cubic root of 21383143 is about 277.5601925537.

The spelling of 21383143 in words is "twenty-one million, three hundred eighty-three thousand, one hundred forty-three".