21382763 has 2 divisors, whose sum is σ = 21382764. Its totient is φ = 21382762.

The previous prime is 21382759. The next prime is 21382783. The reversal of 21382763 is 36728312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21382763 - 2² = 21382759 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21382723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691381 + 10691382.

It is an arithmetic number, because the mean of its divisors is an integer number (10691382).

Almost surely, 2^21382763 is an apocalyptic number.

21382763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21382763 is an equidigital number, since it uses as much as digits as its factorization.

21382763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 21382763 is about 4624.1499759415. The cubic root of 21382763 is about 277.5585483692.

The spelling of 21382763 in words is "twenty-one million, three hundred eighty-two thousand, seven hundred sixty-three".