21002350349 has 2 divisors, whose sum is σ = 21002350350. Its totient is φ = 21002350348.

The previous prime is 21002350331. The next prime is 21002350451. The reversal of 21002350349 is 94305320012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13915741225 + 7086609124 = 117965^2 + 84182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002350349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002350319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501175174 + 10501175175.

It is an arithmetic number, because the mean of its divisors is an integer number (10501175175).

Almost surely, 2^21002350349 is an apocalyptic number.

It is an amenable number.

21002350349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002350349 is an equidigital number, since it uses as much as digits as its factorization.

21002350349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 21002350349 in words is "twenty-one billion, two million, three hundred fifty thousand, three hundred forty-nine".