1223030021 has 4 divisors (see below), whose sum is σ = 1265203500. Its totient is φ = 1180856544.

The previous prime is 1223029987. The next prime is 1223030023. The reversal of 1223030021 is 1200303221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200303221 = 13 ⋅92331017.

It can be written as a sum of positive squares in 2 ways, for example, as 1038450625 + 184579396 = 32225^2 + 13586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223030021 - 2⁶ = 1223029957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223029978 and 1223030005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223030023) 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, 21086696 + ... + 21086753.

It is an arithmetic number, because the mean of its divisors is an integer number (316300875).

Almost surely, 2^1223030021 is an apocalyptic number.

It is an amenable number.

1223030021 is a deficient number, since it is larger than the sum of its proper divisors (42173479).

1223030021 is an equidigital number, since it uses as much as digits as its factorization.

1223030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42173478.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1223030021 is about 34971.8461194144. The cubic root of 1223030021 is about 1069.4136074251.

Adding to 1223030021 its reverse (1200303221), we get a palindrome (2423333242).

The spelling of 1223030021 in words is "one billion, two hundred twenty-three million, thirty thousand, twenty-one".