21949303 has 2 divisors, whose sum is σ = 21949304. Its totient is φ = 21949302.

The previous prime is 21949273. The next prime is 21949331. The reversal of 21949303 is 30394912.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21949303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21949373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10974651 + 10974652.

It is an arithmetic number, because the mean of its divisors is an integer number (10974652).

Almost surely, 2^21949303 is an apocalyptic number.

21949303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21949303 is an equidigital number, since it uses as much as digits as its factorization.

21949303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 21949303 is about 4685.0083244323. The cubic root of 21949303 is about 279.9885326936.

The spelling of 21949303 in words is "twenty-one million, nine hundred forty-nine thousand, three hundred three".