21948299 has 2 divisors, whose sum is σ = 21948300. Its totient is φ = 21948298.

The previous prime is 21948293. The next prime is 21948313. The reversal of 21948299 is 99284912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21948299 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21948293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10974149 + 10974150.

It is an arithmetic number, because the mean of its divisors is an integer number (10974150).

Almost surely, 2^21948299 is an apocalyptic number.

21948299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21948299 is an equidigital number, since it uses as much as digits as its factorization.

21948299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 21948299 is about 4684.9011729171. The cubic root of 21948299 is about 279.9842635714.

The spelling of 21948299 in words is "twenty-one million, nine hundred forty-eight thousand, two hundred ninety-nine".