1225221223 has 4 divisors (see below), whose sum is σ = 1225298008. Its totient is φ = 1225144440.

The previous prime is 1225221211. The next prime is 1225221253. The reversal of 1225221223 is 3221225221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3221225221 = 31 ⋅103910491.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225221223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225221194 and 1225221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225221253) 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, 4461 + ... + 49702.

It is an arithmetic number, because the mean of its divisors is an integer number (306324502).

Almost surely, 2^1225221223 is an apocalyptic number.

1225221223 is a deficient number, since it is larger than the sum of its proper divisors (76785).

1225221223 is an equidigital number, since it uses as much as digits as its factorization.

1225221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76784.

The product of its digits is 960, while the sum is 22.

The square root of 1225221223 is about 35003.1601859032. The cubic root of 1225221223 is about 1070.0518864407.

Adding to 1225221223 its reverse (3221225221), we get a palindrome (4446446444).

The spelling of 1225221223 in words is "one billion, two hundred twenty-five million, two hundred twenty-one thousand, two hundred twenty-three".