21302299 has 2 divisors, whose sum is σ = 21302300. Its totient is φ = 21302298.

The previous prime is 21302293. The next prime is 21302321. The reversal of 21302299 is 99220312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21302299 - 2³ = 21302291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21302291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651149 + 10651150.

It is an arithmetic number, because the mean of its divisors is an integer number (10651150).

Almost surely, 2^21302299 is an apocalyptic number.

21302299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302299 is an equidigital number, since it uses as much as digits as its factorization.

21302299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21302299 is about 4615.4413656767. The cubic root of 21302299 is about 277.2099569423.

The spelling of 21302299 in words is "twenty-one million, three hundred two thousand, two hundred ninety-nine".