21212119 has 2 divisors, whose sum is σ = 21212120. Its totient is φ = 21212118.

The previous prime is 21212111. The next prime is 21212131. The reversal of 21212119 is 91121212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212119 - 2³ = 21212111 is a prime.

It is a super-2 number, since 2×21212119² = 899907984940322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212096 and 21212105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606059 + 10606060.

It is an arithmetic number, because the mean of its divisors is an integer number (10606060).

Almost surely, 2^21212119 is an apocalyptic number.

21212119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212119 is an equidigital number, since it uses as much as digits as its factorization.

21212119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 19.

The square root of 21212119 is about 4605.6616245660. The cubic root of 21212119 is about 276.8182284361.

It can be divided in two parts, 2 and 1212119, that added together give a palindrome (1212121).

The spelling of 21212119 in words is "twenty-one million, two hundred twelve thousand, one hundred nineteen".