1221223503 has 8 divisors (see below), whose sum is σ = 1629530368. Its totient is φ = 813532824.

The previous prime is 1221223483. The next prime is 1221223511. The reversal of 1221223503 is 3053221221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221223503 - 2⁶ = 1221223439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221223503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221223103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149401 + ... + 157362.

It is an arithmetic number, because the mean of its divisors is an integer number (203691296).

Almost surely, 2^1221223503 is an apocalyptic number.

1221223503 is a deficient number, since it is larger than the sum of its proper divisors (408306865).

1221223503 is a wasteful number, since it uses less digits than its factorization.

1221223503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308093.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1221223503 is about 34946.0083986712. The cubic root of 1221223503 is about 1068.8868100777.

Adding to 1221223503 its reverse (3053221221), we get a palindrome (4274444724).

The spelling of 1221223503 in words is "one billion, two hundred twenty-one million, two hundred twenty-three thousand, five hundred three".