1211123401 has 16 divisors (see below), whose sum is σ = 1311780096. Its totient is φ = 1113815296.

The previous prime is 1211123377. The next prime is 1211123413. The reversal of 1211123401 is 1043211121.

It is a cyclic number.

It is not a de Polignac number, because 1211123401 - 2⁹ = 1211122889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211123461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947775 + ... + 949051.

It is an arithmetic number, because the mean of its divisors is an integer number (81986256).

Almost surely, 2^1211123401 is an apocalyptic number.

It is an amenable number.

1211123401 is a deficient number, since it is larger than the sum of its proper divisors (100656695).

1211123401 is a wasteful number, since it uses less digits than its factorization.

1211123401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1211123401 is about 34801.1982695999. The cubic root of 1211123401 is about 1065.9319139939.

Adding to 1211123401 its reverse (1043211121), we get a palindrome (2254334522).

The spelling of 1211123401 in words is "one billion, two hundred eleven million, one hundred twenty-three thousand, four hundred one".