1423121111 has 4 divisors (see below), whose sum is σ = 1457831424. Its totient is φ = 1388410800.

The previous prime is 1423121099. The next prime is 1423121137. The reversal of 1423121111 is 1111213241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1423121111 - 2²² = 1418926807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1423121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423121171) 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 3 ways as a sum of consecutive naturals, for example, 17355095 + ... + 17355176.

It is an arithmetic number, because the mean of its divisors is an integer number (364457856).

Almost surely, 2^1423121111 is an apocalyptic number.

1423121111 is a deficient number, since it is larger than the sum of its proper divisors (34710313).

1423121111 is an equidigital number, since it uses as much as digits as its factorization.

1423121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34710312.

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

The square root of 1423121111 is about 37724.2774748570. The cubic root of 1423121111 is about 1124.8137597216.

Adding to 1423121111 its reverse (1111213241), we get a palindrome (2534334352).

The spelling of 1423121111 in words is "one billion, four hundred twenty-three million, one hundred twenty-one thousand, one hundred eleven".