1111123421 has 4 divisors (see below), whose sum is σ = 1146966144. Its totient is φ = 1075280700.

The previous prime is 1111123379. The next prime is 1111123441. The reversal of 1111123421 is 1243211111.

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 a cyclic number.

It is not a de Polignac number, because 1111123421 - 2¹⁴ = 1111107037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111123421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111123441) 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, 17921315 + ... + 17921376.

It is an arithmetic number, because the mean of its divisors is an integer number (286741536).

Almost surely, 2^1111123421 is an apocalyptic number.

It is an amenable number.

1111123421 is a deficient number, since it is larger than the sum of its proper divisors (35842723).

1111123421 is an equidigital number, since it uses as much as digits as its factorization.

1111123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35842722.

The product of its digits is 48, while the sum is 17.

The square root of 1111123421 is about 33333.5179811552. The cubic root of 1111123421 is about 1035.7479936059.

Adding to 1111123421 its reverse (1243211111), we get a palindrome (2354334532).

The spelling of 1111123421 in words is "one billion, one hundred eleven million, one hundred twenty-three thousand, four hundred twenty-one".