1113212123 has 4 divisors (see below), whose sum is σ = 1113909048. Its totient is φ = 1112515200.

The previous prime is 1113212117. The next prime is 1113212137. The reversal of 1113212123 is 3212123111.

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 1113212123 - 2¹⁸ = 1112949979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1113212923) 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, 346061 + ... + 349262.

It is an arithmetic number, because the mean of its divisors is an integer number (278477262).

Almost surely, 2^1113212123 is an apocalyptic number.

1113212123 is a deficient number, since it is larger than the sum of its proper divisors (696925).

1113212123 is an equidigital number, since it uses as much as digits as its factorization.

1113212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696924.

The product of its digits is 72, while the sum is 17.

The square root of 1113212123 is about 33364.8336276385. The cubic root of 1113212123 is about 1036.3965908435.

Adding to 1113212123 its reverse (3212123111), we get a palindrome (4325335234).

It can be divided in two parts, 111 and 3212123, that multiplied together give a palindrome (356545653).

The spelling of 1113212123 in words is "one billion, one hundred thirteen million, two hundred twelve thousand, one hundred twenty-three".