21142223309 has 2 divisors, whose sum is σ = 21142223310. Its totient is φ = 21142223308.

The previous prime is 21142223299. The next prime is 21142223413. The reversal of 21142223309 is 90332224112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14244422500 + 6897800809 = 119350^2 + 83053^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142223309 - 2¹² = 21142219213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142123309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571111654 + 10571111655.

It is an arithmetic number, because the mean of its divisors is an integer number (10571111655).

Almost surely, 2^21142223309 is an apocalyptic number.

It is an amenable number.

21142223309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142223309 is an equidigital number, since it uses as much as digits as its factorization.

21142223309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21142223309 in words is "twenty-one billion, one hundred forty-two million, two hundred twenty-three thousand, three hundred nine".