1223203021 has 4 divisors (see below), whose sum is σ = 1235314044. Its totient is φ = 1211092000.

The previous prime is 1223203013. The next prime is 1223203031. The reversal of 1223203021 is 1203023221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1203023221 = 101 ⋅11911121.

It can be written as a sum of positive squares in 2 ways, for example, as 529460100 + 693742921 = 23010^2 + 26339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223203021 - 2³ = 1223203013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223202986 and 1223203004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223203031) 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, 6055360 + ... + 6055561.

It is an arithmetic number, because the mean of its divisors is an integer number (308828511).

Almost surely, 2^1223203021 is an apocalyptic number.

It is an amenable number.

1223203021 is a deficient number, since it is larger than the sum of its proper divisors (12111023).

1223203021 is a wasteful number, since it uses less digits than its factorization.

1223203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12111022.

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

The square root of 1223203021 is about 34974.3194501337. The cubic root of 1223203021 is about 1069.4640285999.

Adding to 1223203021 its reverse (1203023221), we get a palindrome (2426226242).

The spelling of 1223203021 in words is "one billion, two hundred twenty-three million, two hundred three thousand, twenty-one".