21002341291 has 2 divisors, whose sum is σ = 21002341292. Its totient is φ = 21002341290.

The previous prime is 21002341247. The next prime is 21002341309. The reversal of 21002341291 is 19214320012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002341291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002348291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501170645 + 10501170646.

It is an arithmetic number, because the mean of its divisors is an integer number (10501170646).

Almost surely, 2^21002341291 is an apocalyptic number.

21002341291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002341291 is an equidigital number, since it uses as much as digits as its factorization.

21002341291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21002341291 in words is "twenty-one billion, two million, three hundred forty-one thousand, two hundred ninety-one".