1211110401 has 4 divisors (see below), whose sum is σ = 1614813872. Its totient is φ = 807406932.

The previous prime is 1211110393. The next prime is 1211110427. The reversal of 1211110401 is 1040111121.

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 not a de Polignac number, because 1211110401 - 2³ = 1211110393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211110451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201851731 + ... + 201851736.

It is an arithmetic number, because the mean of its divisors is an integer number (403703468).

Almost surely, 2^1211110401 is an apocalyptic number.

It is an amenable number.

1211110401 is a deficient number, since it is larger than the sum of its proper divisors (403703471).

1211110401 is an equidigital number, since it uses as much as digits as its factorization.

1211110401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403703470.

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

The square root of 1211110401 is about 34801.0114939207. The cubic root of 1211110401 is about 1065.9281001341.

Adding to 1211110401 its reverse (1040111121), we get a palindrome (2251221522).

The spelling of 1211110401 in words is "one billion, two hundred eleven million, one hundred ten thousand, four hundred one".