1211421199 has 2 divisors, whose sum is σ = 1211421200. Its totient is φ = 1211421198.

The previous prime is 1211421179. The next prime is 1211421227. The reversal of 1211421199 is 9911241121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211421199 - 2¹¹ = 1211419151 is a prime.

It is a super-3 number, since 3×1211421199³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211421199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211421149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605710599 + 605710600.

It is an arithmetic number, because the mean of its divisors is an integer number (605710600).

Almost surely, 2^1211421199 is an apocalyptic number.

1211421199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211421199 is an equidigital number, since it uses as much as digits as its factorization.

1211421199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 31.

The square root of 1211421199 is about 34805.4765661957. The cubic root of 1211421199 is about 1066.0192726611.

The spelling of 1211421199 in words is "one billion, two hundred eleven million, four hundred twenty-one thousand, one hundred ninety-nine".