21238363 has 2 divisors, whose sum is σ = 21238364. Its totient is φ = 21238362.

The previous prime is 21238351. The next prime is 21238429. The reversal of 21238363 is 36383212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21238363 - 2¹³ = 21230171 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (21238303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10619181 + 10619182.

It is an arithmetic number, because the mean of its divisors is an integer number (10619182).

Almost surely, 2^21238363 is an apocalyptic number.

21238363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21238363 is an equidigital number, since it uses as much as digits as its factorization.

21238363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 28.

The square root of 21238363 is about 4608.5098459263. The cubic root of 21238363 is about 276.9323428187.

The spelling of 21238363 in words is "twenty-one million, two hundred thirty-eight thousand, three hundred sixty-three".