1121211001 has 4 divisors (see below), whose sum is σ = 1121280912. Its totient is φ = 1121141092.

The previous prime is 1121210983. The next prime is 1121211017. The reversal of 1121211001 is 1001121211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1121211001 - 2⁷ = 1121210873 is a prime.

It is a super-2 number, since 2×1121211001² = 2514228217526844002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121211041) 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, 2430 + ... + 47416.

It is an arithmetic number, because the mean of its divisors is an integer number (280320228).

Almost surely, 2^1121211001 is an apocalyptic number.

It is an amenable number.

1121211001 is a deficient number, since it is larger than the sum of its proper divisors (69911).

1121211001 is an equidigital number, since it uses as much as digits as its factorization.

1121211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69910.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1121211001 is about 33484.4889613086. The cubic root of 1121211001 is about 1038.8729781420.

Adding to 1121211001 its reverse (1001121211), we get a palindrome (2122332212).

The spelling of 1121211001 in words is "one billion, one hundred twenty-one million, two hundred eleven thousand, one".