1123123667021 has 4 divisors (see below), whose sum is σ = 1149242822112. Its totient is φ = 1097004511932.

The previous prime is 1123123666999. The next prime is 1123123667047. The reversal of 1123123667021 is 1207663213211.

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 1123123667021 - 2¹⁸ = 1123123404877 is a prime.

It is a super-2 number, since 2×1123123667021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123123667821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13059577481 + ... + 13059577566.

It is an arithmetic number, because the mean of its divisors is an integer number (287310705528).

Almost surely, 2^{1123123667021} is an apocalyptic number.

It is an amenable number.

1123123667021 is a deficient number, since it is larger than the sum of its proper divisors (26119155091).

1123123667021 is an equidigital number, since it uses as much as digits as its factorization.

1123123667021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26119155090.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 1123123667021 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-three million, six hundred sixty-seven thousand, twenty-one".