21838963 has 2 divisors, whose sum is σ = 21838964. Its totient is φ = 21838962.

The previous prime is 21838951. The next prime is 21838967. The reversal of 21838963 is 36983812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21838963 - 2⁹ = 21838451 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 (21838967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919481 + 10919482.

It is an arithmetic number, because the mean of its divisors is an integer number (10919482).

Almost surely, 2^21838963 is an apocalyptic number.

21838963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21838963 is an equidigital number, since it uses as much as digits as its factorization.

21838963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 21838963 is about 4673.2176281444. The cubic root of 21838963 is about 279.5185732284.

It can be divided in two parts, 21838 and 963, that added together give a square (22801 = 151²).

The spelling of 21838963 in words is "twenty-one million, eight hundred thirty-eight thousand, nine hundred sixty-three".