21102002347 has 2 divisors, whose sum is σ = 21102002348. Its totient is φ = 21102002346.

The previous prime is 21102002323. The next prime is 21102002407. The reversal of 21102002347 is 74320020112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102002347 - 2¹⁵ = 21101969579 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102002147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551001173 + 10551001174.

It is an arithmetic number, because the mean of its divisors is an integer number (10551001174).

Almost surely, 2^21102002347 is an apocalyptic number.

21102002347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102002347 is an equidigital number, since it uses as much as digits as its factorization.

21102002347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 21102002347 its reverse (74320020112), we get a palindrome (95422022459).

The spelling of 21102002347 in words is "twenty-one billion, one hundred two million, two thousand, three hundred forty-seven".