1212001099 has 4 divisors (see below), whose sum is σ = 1212326440. Its totient is φ = 1211675760.

The previous prime is 1212001039. The next prime is 1212001121. The reversal of 1212001099 is 9901002121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9901002121 = 2281 ⋅4340641.

It is a cyclic number.

It is not a de Polignac number, because 1212001099 - 2²⁵ = 1178446667 is a prime.

It is a super-3 number, since 3×1212001099³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212001019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157017 + ... + 164554.

It is an arithmetic number, because the mean of its divisors is an integer number (303081610).

Almost surely, 2^1212001099 is an apocalyptic number.

1212001099 is a deficient number, since it is larger than the sum of its proper divisors (325341).

1212001099 is an equidigital number, since it uses as much as digits as its factorization.

1212001099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325340.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1212001099 is about 34813.8061550299. The cubic root of 1212001099 is about 1066.1893445190.

The spelling of 1212001099 in words is "one billion, two hundred twelve million, one thousand, ninety-nine".