1121721711 has 64 divisors (see below), whose sum is σ = 1759795200. Its totient is φ = 628992000.

The previous prime is 1121721683. The next prime is 1121721751. The reversal of 1121721711 is 1171271211.

It is not a de Polignac number, because 1121721711 - 2⁶ = 1121721647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121721751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2797111 + ... + 2797511.

It is an arithmetic number, because the mean of its divisors is an integer number (27496800).

Almost surely, 2^1121721711 is an apocalyptic number.

1121721711 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1121721711 is a deficient number, since it is larger than the sum of its proper divisors (638073489).

1121721711 is a wasteful number, since it uses less digits than its factorization.

1121721711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560.

The product of its digits is 196, while the sum is 24.

The square root of 1121721711 is about 33492.1141613963. The cubic root of 1121721711 is about 1039.0306892484.

Adding to 1121721711 its reverse (1171271211), we get a palindrome (2292992922).

The spelling of 1121721711 in words is "one billion, one hundred twenty-one million, seven hundred twenty-one thousand, seven hundred eleven".