1211121201 has 4 divisors (see below), whose sum is σ = 1614828272. Its totient is φ = 807414132.

The previous prime is 1211121193. The next prime is 1211121209. The reversal of 1211121201 is 1021211121.

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 an interprime number because it is at equal distance from previous prime (1211121193) and next prime (1211121209).

It is not a de Polignac number, because 1211121201 - 2³ = 1211121193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211121209) 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, 201853531 + ... + 201853536.

It is an arithmetic number, because the mean of its divisors is an integer number (403707068).

Almost surely, 2^1211121201 is an apocalyptic number.

It is an amenable number.

1211121201 is a deficient number, since it is larger than the sum of its proper divisors (403707071).

1211121201 is an equidigital number, since it uses as much as digits as its factorization.

1211121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403707070.

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

The square root of 1211121201 is about 34801.1666614785. The cubic root of 1211121201 is about 1065.9312685734.

Adding to 1211121201 its reverse (1021211121), we get a palindrome (2232332322).

The spelling of 1211121201 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred one".