1201121211 has 4 divisors (see below), whose sum is σ = 1601494952. Its totient is φ = 800747472.

The previous prime is 1201121149. The next prime is 1201121219. The reversal of 1201121211 is 1121211021.

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

It is not a de Polignac number, because 1201121211 - 2¹⁵ = 1201088443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201121219) 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, 200186866 + ... + 200186871.

It is an arithmetic number, because the mean of its divisors is an integer number (400373738).

Almost surely, 2^1201121211 is an apocalyptic number.

1201121211 is a deficient number, since it is larger than the sum of its proper divisors (400373741).

1201121211 is an equidigital number, since it uses as much as digits as its factorization.

1201121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400373740.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1201121211 is about 34657.1956597761. The cubic root of 1201121211 is about 1062.9894285134.

Adding to 1201121211 its reverse (1121211021), we get a palindrome (2322332232).

The spelling of 1201121211 in words is "one billion, two hundred one million, one hundred twenty-one thousand, two hundred eleven".