1221303423 has 8 divisors (see below), whose sum is σ = 1649017600. Its totient is φ = 803895768.

The previous prime is 1221303401. The next prime is 1221303439. The reversal of 1221303423 is 3243031221.

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

It is not a de Polignac number, because 1221303423 - 2⁹ = 1221302911 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 1221303423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221303323) 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, 2576353 + ... + 2576826.

It is an arithmetic number, because the mean of its divisors is an integer number (206127200).

Almost surely, 2^1221303423 is an apocalyptic number.

1221303423 is a deficient number, since it is larger than the sum of its proper divisors (427714177).

1221303423 is an equidigital number, since it uses as much as digits as its factorization.

1221303423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153261.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1221303423 is about 34947.1518581987. The cubic root of 1221303423 is about 1068.9101264677.

Adding to 1221303423 its reverse (3243031221), we get a palindrome (4464334644).

The spelling of 1221303423 in words is "one billion, two hundred twenty-one million, three hundred three thousand, four hundred twenty-three".