21331030349 has 2 divisors, whose sum is σ = 21331030350. Its totient is φ = 21331030348.

The previous prime is 21331030307. The next prime is 21331030351. The reversal of 21331030349 is 94303013312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13200401449 + 8130628900 = 114893^2 + 90170^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331030349 - 2¹⁶ = 21330964813 is a prime.

Together with 21331030351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331030849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665515174 + 10665515175.

It is an arithmetic number, because the mean of its divisors is an integer number (10665515175).

Almost surely, 2^21331030349 is an apocalyptic number.

It is an amenable number.

21331030349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331030349 is an equidigital number, since it uses as much as digits as its factorization.

21331030349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 29.

The spelling of 21331030349 in words is "twenty-one billion, three hundred thirty-one million, thirty thousand, three hundred forty-nine".