21213442219 has 2 divisors, whose sum is σ = 21213442220. Its totient is φ = 21213442218.

The previous prime is 21213442213. The next prime is 21213442241. The reversal of 21213442219 is 91224431212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213442219 - 2¹³ = 21213434027 is a prime.

It is a super-2 number, since 2×21213442219² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21213442213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606721109 + 10606721110.

It is an arithmetic number, because the mean of its divisors is an integer number (10606721110).

Almost surely, 2^21213442219 is an apocalyptic number.

21213442219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213442219 is an equidigital number, since it uses as much as digits as its factorization.

21213442219 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 21213442219 in words is "twenty-one billion, two hundred thirteen million, four hundred forty-two thousand, two hundred nineteen".