21985303 has 2 divisors, whose sum is σ = 21985304. Its totient is φ = 21985302.

The previous prime is 21985297. The next prime is 21985319. The reversal of 21985303 is 30358912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21985303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21985373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10992651 + 10992652.

It is an arithmetic number, because the mean of its divisors is an integer number (10992652).

Almost surely, 2^21985303 is an apocalyptic number.

21985303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21985303 is an equidigital number, since it uses as much as digits as its factorization.

21985303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 21985303 is about 4688.8487926142. The cubic root of 21985303 is about 280.1415228446.

The spelling of 21985303 in words is "twenty-one million, nine hundred eighty-five thousand, three hundred three".