1121200121 has 4 divisors (see below), whose sum is σ = 1136991744. Its totient is φ = 1105408500.

The previous prime is 1121200081. The next prime is 1121200141. The reversal of 1121200121 is 1210021211.

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 an emirpimes, since its reverse is a distinct semiprime: 1210021211 = 7 ⋅172860173.

It is a cyclic number.

It is not a de Polignac number, because 1121200121 - 2⁶ = 1121200057 is a prime.

It is a super-2 number, since 2×1121200121² = 2514179422660829282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121200141) 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, 7895705 + ... + 7895846.

It is an arithmetic number, because the mean of its divisors is an integer number (284247936).

Almost surely, 2^1121200121 is an apocalyptic number.

It is an amenable number.

1121200121 is a deficient number, since it is larger than the sum of its proper divisors (15791623).

1121200121 is an equidigital number, since it uses as much as digits as its factorization.

1121200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15791622.

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

The square root of 1121200121 is about 33484.3264976317. The cubic root of 1121200121 is about 1038.8696177949.

Adding to 1121200121 its reverse (1210021211), we get a palindrome (2331221332).

The spelling of 1121200121 in words is "one billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-one".