1121221001 has 4 divisors (see below), whose sum is σ = 1147295952. Its totient is φ = 1095146052.

The previous prime is 1121220967. The next prime is 1121221019. The reversal of 1121221001 is 1001221211.

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.

It is a cyclic number.

It is not a de Polignac number, because 1121221001 - 2¹⁰ = 1121219977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121221061) 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, 13037411 + ... + 13037496.

It is an arithmetic number, because the mean of its divisors is an integer number (286823988).

Almost surely, 2^1121221001 is an apocalyptic number.

It is an amenable number.

1121221001 is a deficient number, since it is larger than the sum of its proper divisors (26074951).

1121221001 is an equidigital number, since it uses as much as digits as its factorization.

1121221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26074950.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1121221001 is about 33484.6382838459. The cubic root of 1121221001 is about 1038.8760666772.

Adding to 1121221001 its reverse (1001221211), we get a palindrome (2122442212).

The spelling of 1121221001 in words is "one billion, one hundred twenty-one million, two hundred twenty-one thousand, one".