1121211999 has 48 divisors (see below), whose sum is σ = 1818236160. Its totient is φ = 662307840.

The previous prime is 1121211991. The next prime is 1121212013. The reversal of 1121211999 is 9991121211.

It is not a de Polignac number, because 1121211999 - 2³ = 1121211991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121211991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 172297 + ... + 178685.

It is an arithmetic number, because the mean of its divisors is an integer number (37879920).

Almost surely, 2^1121211999 is an apocalyptic number.

1121211999 is a deficient number, since it is larger than the sum of its proper divisors (697024161).

1121211999 is a wasteful number, since it uses less digits than its factorization.

1121211999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6480 (or 6477 counting only the distinct ones).

The product of its digits is 2916, while the sum is 36.

The square root of 1121211999 is about 33484.5038637278. The cubic root of 1121211999 is about 1038.8732863787.

The spelling of 1121211999 in words is "one billion, one hundred twenty-one million, two hundred eleven thousand, nine hundred ninety-nine".