1121721712 has 20 divisors (see below), whose sum is σ = 2173923360. Its totient is φ = 560709248.

The previous prime is 1121721683. The next prime is 1121721751. The reversal of 1121721712 is 2171271211.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73668 + ... + 87580.

It is an arithmetic number, because the mean of its divisors is an integer number (108696168).

Almost surely, 2^1121721712 is an apocalyptic number.

It is an amenable number.

1121721712 is a deficient number, since it is larger than the sum of its proper divisors (1052201648).

1121721712 is a wasteful number, since it uses less digits than its factorization.

1121721712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18960 (or 18954 counting only the distinct ones).

The product of its digits is 392, while the sum is 25.

The square root of 1121721712 is about 33492.1141763251. The cubic root of 1121721712 is about 1039.0306895571.

Adding to 1121721712 its reverse (2171271211), we get a palindrome (3292992923).

The spelling of 1121721712 in words is "one billion, one hundred twenty-one million, seven hundred twenty-one thousand, seven hundred twelve".