1223023021 has 4 divisors (see below), whose sum is σ = 1334206944. Its totient is φ = 1111839100.

The previous prime is 1223023007. The next prime is 1223023057. The reversal of 1223023021 is 1203203221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1203203221 = 11 ⋅109382111.

It is a cyclic number.

It is not a de Polignac number, because 1223023021 - 2¹⁵ = 1222990253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223022986 and 1223023004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223023121) 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, 55591945 + ... + 55591966.

It is an arithmetic number, because the mean of its divisors is an integer number (333551736).

Almost surely, 2^1223023021 is an apocalyptic number.

1223023021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1223023021 is a deficient number, since it is larger than the sum of its proper divisors (111183923).

1223023021 is a wasteful number, since it uses less digits than its factorization.

1223023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111183922.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1223023021 is about 34971.7460387668. The cubic root of 1223023021 is about 1069.4115671619.

Adding to 1223023021 its reverse (1203203221), we get a palindrome (2426226242).

The spelling of 1223023021 in words is "one billion, two hundred twenty-three million, twenty-three thousand, twenty-one".