1211011201 has 4 divisors (see below), whose sum is σ = 1282247172. Its totient is φ = 1139775232.

The previous prime is 1211011199. The next prime is 1211011211. The reversal of 1211011201 is 1021101121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1021101121 = 5501 ⋅185621.

It can be written as a sum of positive squares in 2 ways, for example, as 448422976 + 762588225 = 21176^2 + 27615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211011201 - 2¹ = 1211011199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211011211) 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, 35617960 + ... + 35617993.

It is an arithmetic number, because the mean of its divisors is an integer number (320561793).

Almost surely, 2^1211011201 is an apocalyptic number.

It is an amenable number.

1211011201 is a deficient number, since it is larger than the sum of its proper divisors (71235971).

1211011201 is an equidigital number, since it uses as much as digits as its factorization.

1211011201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71235970.

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

The square root of 1211011201 is about 34799.5862188044. The cubic root of 1211011201 is about 1065.8989965516.

Adding to 1211011201 its reverse (1021101121), we get a palindrome (2232112322).

It can be divided in two parts, 121101120 and 1, that added together give a palindrome (121101121).

The spelling of 1211011201 in words is "one billion, two hundred eleven million, eleven thousand, two hundred one".