21334210242209 has 2 divisors, whose sum is σ = 21334210242210. Its totient is φ = 21334210242208.

The previous prime is 21334210242173. The next prime is 21334210242227. The reversal of 21334210242209 is 90224201243312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11752418112400 + 9581792129809 = 3428180^2 + 3095447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21334210242209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21334210242269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667105121104 + 10667105121105.

It is an arithmetic number, because the mean of its divisors is an integer number (10667105121105).

Almost surely, 2^{21334210242209} is an apocalyptic number.

It is an amenable number.

21334210242209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334210242209 is an equidigital number, since it uses as much as digits as its factorization.

21334210242209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 21334210242209 in words is "twenty-one trillion, three hundred thirty-four billion, two hundred ten million, two hundred forty-two thousand, two hundred nine".