1123042112021 has 4 divisors (see below), whose sum is σ = 1123044451200. Its totient is φ = 1123039772844.

The previous prime is 1123042112009. The next prime is 1123042112029. The reversal of 1123042112021 is 1202112403211.

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 1123042112021 - 2⁶ = 1123042111957 is a prime.

It is a super-2 number, since 2×1123042112021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123042111984 and 1123042112002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123042112029) 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, 157511 + ... + 1506948.

It is an arithmetic number, because the mean of its divisors is an integer number (280761112800).

Almost surely, 2^{1123042112021} is an apocalyptic number.

It is an amenable number.

1123042112021 is a deficient number, since it is larger than the sum of its proper divisors (2339179).

1123042112021 is an equidigital number, since it uses as much as digits as its factorization.

1123042112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339178.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1123042112021 its reverse (1202112403211), we get a palindrome (2325154515232).

The spelling of 1123042112021 in words is "one trillion, one hundred twenty-three billion, forty-two million, one hundred twelve thousand, twenty-one".