1122121999 has 4 divisors (see below), whose sum is σ = 1170909936. Its totient is φ = 1073334064.

The previous prime is 1122121997. The next prime is 1122122011. The reversal of 1122121999 is 9991212211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9991212211 = 29 ⋅344524559.

It is a cyclic number.

It is not a de Polignac number, because 1122121999 - 2¹ = 1122121997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122121991) 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, 24393934 + ... + 24393979.

It is an arithmetic number, because the mean of its divisors is an integer number (292727484).

Almost surely, 2^1122121999 is an apocalyptic number.

1122121999 is a deficient number, since it is larger than the sum of its proper divisors (48787937).

1122121999 is an equidigital number, since it uses as much as digits as its factorization.

1122121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48787936.

The product of its digits is 5832, while the sum is 37.

The square root of 1122121999 is about 33498.0894828347. The cubic root of 1122121999 is about 1039.1542677466.

The spelling of 1122121999 in words is "one billion, one hundred twenty-two million, one hundred twenty-one thousand, nine hundred ninety-nine".