21243214219 has 2 divisors, whose sum is σ = 21243214220. Its totient is φ = 21243214218.

The previous prime is 21243214199. The next prime is 21243214243. The reversal of 21243214219 is 91241234212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21243214219 - 2¹³ = 21243206027 is a prime.

It is a super-2 number, since 2×21243214219² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21243214249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621607109 + 10621607110.

It is an arithmetic number, because the mean of its divisors is an integer number (10621607110).

Almost surely, 2^21243214219 is an apocalyptic number.

21243214219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21243214219 is an equidigital number, since it uses as much as digits as its factorization.

21243214219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The spelling of 21243214219 in words is "twenty-one billion, two hundred forty-three million, two hundred fourteen thousand, two hundred nineteen".