1221142303 has 4 divisors (see below), whose sum is σ = 1221248848. Its totient is φ = 1221035760.

The previous prime is 1221142229. The next prime is 1221142309. The reversal of 1221142303 is 3032411221.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1221142303 - 2⁹ = 1221141791 is a prime.

It is a super-2 number, since 2×1221142303² = 2982377048352287618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221142309) 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, 33678 + ... + 59803.

It is an arithmetic number, because the mean of its divisors is an integer number (305312212).

Almost surely, 2^1221142303 is an apocalyptic number.

1221142303 is a deficient number, since it is larger than the sum of its proper divisors (106545).

1221142303 is an equidigital number, since it uses as much as digits as its factorization.

1221142303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106544.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1221142303 is about 34944.8465871579. The cubic root of 1221142303 is about 1068.8631192101.

Adding to 1221142303 its reverse (3032411221), we get a palindrome (4253553524).

The spelling of 1221142303 in words is "one billion, two hundred twenty-one million, one hundred forty-two thousand, three hundred three".