21221674351349 has 2 divisors, whose sum is σ = 21221674351350. Its totient is φ = 21221674351348.

The previous prime is 21221674351333. The next prime is 21221674351363. The reversal of 21221674351349 is 94315347612212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21187010614225 + 34663737124 = 4602935^2 + 186182^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221674351349 - 2⁴ = 21221674351333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221674351297 and 21221674351306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221674351309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610837175674 + 10610837175675.

It is an arithmetic number, because the mean of its divisors is an integer number (10610837175675).

Almost surely, 2^{21221674351349} is an apocalyptic number.

It is an amenable number.

21221674351349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221674351349 is an equidigital number, since it uses as much as digits as its factorization.

21221674351349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 50.

The spelling of 21221674351349 in words is "twenty-one trillion, two hundred twenty-one billion, six hundred seventy-four million, three hundred fifty-one thousand, three hundred forty-nine".