21829763 has 2 divisors, whose sum is σ = 21829764. Its totient is φ = 21829762.

The previous prime is 21829729. The next prime is 21829777. The reversal of 21829763 is 36792812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21829763 - 2⁶ = 21829699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21829723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10914881 + 10914882.

It is an arithmetic number, because the mean of its divisors is an integer number (10914882).

Almost surely, 2^21829763 is an apocalyptic number.

21829763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21829763 is an equidigital number, since it uses as much as digits as its factorization.

21829763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 21829763 is about 4672.2331919544. The cubic root of 21829763 is about 279.4793172121.

The spelling of 21829763 in words is "twenty-one million, eight hundred twenty-nine thousand, seven hundred sixty-three".