21970303 has 2 divisors, whose sum is σ = 21970304. Its totient is φ = 21970302.

The previous prime is 21970297. The next prime is 21970339. The reversal of 21970303 is 30307912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21970303 - 2⁵ = 21970271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21970363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10985151 + 10985152.

It is an arithmetic number, because the mean of its divisors is an integer number (10985152).

Almost surely, 2^21970303 is an apocalyptic number.

21970303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21970303 is an equidigital number, since it uses as much as digits as its factorization.

21970303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 21970303 is about 4687.2489799455. The cubic root of 21970303 is about 280.0777972598.

The spelling of 21970303 in words is "twenty-one million, nine hundred seventy thousand, three hundred three".