1121991210 has 32 divisors (see below), whose sum is σ = 2991977280. Its totient is φ = 299197584.

The previous prime is 1121991209. The next prime is 1121991263. The reversal of 1121991210 is 121991211.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2077492 + ... + 2078031.

It is an arithmetic number, because the mean of its divisors is an integer number (93499290).

Almost surely, 2^1121991210 is an apocalyptic number.

1121991210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1121991210 is an abundant number, since it is smaller than the sum of its proper divisors (1869986070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121991210 is a wasteful number, since it uses less digits than its factorization.

1121991210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155539 (or 4155533 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The square root of 1121991210 is about 33496.1372399863. The cubic root of 1121991210 is about 1039.1138932810.

Subtracting from 1121991210 its reverse (121991211), we obtain a palindrome (999999999).

The spelling of 1121991210 in words is "one billion, one hundred twenty-one million, nine hundred ninety-one thousand, two hundred ten".