21002302247 has 2 divisors, whose sum is σ = 21002302248. Its totient is φ = 21002302246.

The previous prime is 21002302177. The next prime is 21002302303. The reversal of 21002302247 is 74220320012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002302247 - 2²² = 20998107943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21007302247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501151123 + 10501151124.

It is an arithmetic number, because the mean of its divisors is an integer number (10501151124).

Almost surely, 2^21002302247 is an apocalyptic number.

21002302247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002302247 is an equidigital number, since it uses as much as digits as its factorization.

21002302247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

Adding to 21002302247 its reverse (74220320012), we get a palindrome (95222622259).

The spelling of 21002302247 in words is "twenty-one billion, two million, three hundred two thousand, two hundred forty-seven".