1211022201 has 16 divisors (see below), whose sum is σ = 1653854400. Its totient is φ = 787805760.

The previous prime is 1211022193. The next prime is 1211022229. The reversal of 1211022201 is 1022201121.

It is not a de Polignac number, because 1211022201 - 2³ = 1211022193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211022271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148375 + ... + 156323.

It is an arithmetic number, because the mean of its divisors is an integer number (103365900).

Almost surely, 2^1211022201 is an apocalyptic number.

It is an amenable number.

1211022201 is a deficient number, since it is larger than the sum of its proper divisors (442832199).

1211022201 is a wasteful number, since it uses less digits than its factorization.

1211022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9176.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1211022201 is about 34799.7442663017. The cubic root of 1211022201 is about 1065.9022238417.

Adding to 1211022201 its reverse (1022201121), we get a palindrome (2233223322).

It can be divided in two parts, 121 and 1022201, that multiplied together give a palindrome (123686321).

The spelling of 1211022201 in words is "one billion, two hundred eleven million, twenty-two thousand, two hundred one".