21088763 has 2 divisors, whose sum is σ = 21088764. Its totient is φ = 21088762.

The previous prime is 21088747. The next prime is 21088787. The reversal of 21088763 is 36788012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21088763 - 2⁴ = 21088747 is a prime.

It is not a weakly prime, because it can be changed into another prime (21088703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10544381 + 10544382.

It is an arithmetic number, because the mean of its divisors is an integer number (10544382).

Almost surely, 2^21088763 is an apocalyptic number.

21088763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21088763 is an equidigital number, since it uses as much as digits as its factorization.

21088763 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21088763 is about 4592.2503198323. The cubic root of 21088763 is about 276.2805861454.

The spelling of 21088763 in words is "twenty-one million, eighty-eight thousand, seven hundred sixty-three".