1221210119 has 2 divisors, whose sum is σ = 1221210120. Its totient is φ = 1221210118.

The previous prime is 1221210043. The next prime is 1221210121. The reversal of 1221210119 is 9110121221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221210119 - 2¹⁶ = 1221144583 is a prime.

It is a super-2 number, since 2×1221210119² = 2982708309495988322, which contains 22 as substring.

Together with 1221210121, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221210119.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221210149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610605059 + 610605060.

It is an arithmetic number, because the mean of its divisors is an integer number (610605060).

Almost surely, 2^1221210119 is an apocalyptic number.

1221210119 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221210119 is an equidigital number, since it uses as much as digits as its factorization.

1221210119 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1221210119 is about 34945.8169027425. The cubic root of 1221210119 is about 1068.8829052414.

The spelling of 1221210119 in words is "one billion, two hundred twenty-one million, two hundred ten thousand, one hundred nineteen".