1211040423 has 8 divisors (see below), whose sum is σ = 1794134000. Its totient is φ = 807360264.

The previous prime is 1211040409. The next prime is 1211040443. The reversal of 1211040423 is 3240401121.

It is not a de Polignac number, because 1211040423 - 2²⁶ = 1143931559 is a prime.

It is a super-2 number, since 2×1211040423² = 2933237812280037858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211040396 and 1211040405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211040443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22426648 + ... + 22426701.

It is an arithmetic number, because the mean of its divisors is an integer number (224266750).

Almost surely, 2^1211040423 is an apocalyptic number.

1211040423 is a deficient number, since it is larger than the sum of its proper divisors (583093577).

1211040423 is an equidigital number, since it uses as much as digits as its factorization.

1211040423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44853358 (or 44853352 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1211040423 is about 34800.0060775857. The cubic root of 1211040423 is about 1065.9075699515.

Adding to 1211040423 its reverse (3240401121), we get a palindrome (4451441544).

The spelling of 1211040423 in words is "one billion, two hundred eleven million, forty thousand, four hundred twenty-three".