21000223231349 has 2 divisors, whose sum is σ = 21000223231350. Its totient is φ = 21000223231348.

The previous prime is 21000223231331. The next prime is 21000223231357. The reversal of 21000223231349 is 94313232200012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14185904550724 + 6814318680625 = 3766418^2 + 2610425^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000223231349 - 2²⁰ = 21000222182773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000223231369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500111615674 + 10500111615675.

It is an arithmetic number, because the mean of its divisors is an integer number (10500111615675).

Almost surely, 2^{21000223231349} is an apocalyptic number.

It is an amenable number.

21000223231349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000223231349 is an equidigital number, since it uses as much as digits as its factorization.

21000223231349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 21000223231349 in words is "twenty-one trillion, two hundred twenty-three million, two hundred thirty-one thousand, three hundred forty-nine".