1210220399 has 2 divisors, whose sum is σ = 1210220400. Its totient is φ = 1210220398.

The previous prime is 1210220393. The next prime is 1210220413. The reversal of 1210220399 is 9930220121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1210220399 - 2²⁰ = 1209171823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210220393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605110199 + 605110200.

It is an arithmetic number, because the mean of its divisors is an integer number (605110200).

Almost surely, 2^1210220399 is an apocalyptic number.

1210220399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210220399 is an equidigital number, since it uses as much as digits as its factorization.

1210220399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1210220399 is about 34788.2221304855. Note that the first 3 decimals coincide. The cubic root of 1210220399 is about 1065.6669319207. Note that the first 3 decimals are identical.

The spelling of 1210220399 in words is "one billion, two hundred ten million, two hundred twenty thousand, three hundred ninety-nine".