21367763 has 2 divisors, whose sum is σ = 21367764. Its totient is φ = 21367762.

The previous prime is 21367747. The next prime is 21367771. The reversal of 21367763 is 36776312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21367763 - 2⁴ = 21367747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21367733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10683881 + 10683882.

It is an arithmetic number, because the mean of its divisors is an integer number (10683882).

Almost surely, 2^21367763 is an apocalyptic number.

21367763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21367763 is an equidigital number, since it uses as much as digits as its factorization.

21367763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 35.

The square root of 21367763 is about 4622.5277716851. The cubic root of 21367763 is about 277.4936307820.

It can be divided in two parts, 213 and 67763, that added together give a palindrome (67976).

The spelling of 21367763 in words is "twenty-one million, three hundred sixty-seven thousand, seven hundred sixty-three".