1121211011 has 4 divisors (see below), whose sum is σ = 1124424000. Its totient is φ = 1117998024.

The previous prime is 1121210983. The next prime is 1121211017. The reversal of 1121211011 is 1101121211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1121211011 - 2¹⁰ = 1121209987 is a prime.

It is a super-2 number, since 2×1121211011² = 2514228262375284242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121210983 and 1121211001.

It is not an unprimeable number, because it can be changed into a prime (1121211017) 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, 1605971 + ... + 1606668.

It is an arithmetic number, because the mean of its divisors is an integer number (281106000).

Almost surely, 2^1121211011 is an apocalyptic number.

1121211011 is a deficient number, since it is larger than the sum of its proper divisors (3212989).

1121211011 is an equidigital number, since it uses as much as digits as its factorization.

1121211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212988.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1121211011 is about 33484.4891106315. The cubic root of 1121211011 is about 1038.8729812306.

Adding to 1121211011 its reverse (1101121211), we get a palindrome (2222332222).

The spelling of 1121211011 in words is "one billion, one hundred twenty-one million, two hundred eleven thousand, eleven".