1221303112 has 16 divisors (see below), whose sum is σ = 2291321340. Its totient is φ = 610284096.

The previous prime is 1221303101. The next prime is 1221303119. The reversal of 1221303112 is 2113031221.

It can be written as a sum of positive squares in 2 ways, for example, as 1168682596 + 52620516 = 34186^2 + 7254^2 .

It is not an unprimeable number, because it can be changed into a prime (1221303119) 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, 31543 + ... + 58630.

Almost surely, 2^1221303112 is an apocalyptic number.

It is an amenable number.

1221303112 is a deficient number, since it is larger than the sum of its proper divisors (1070018228).

1221303112 is a wasteful number, since it uses less digits than its factorization.

1221303112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91872 (or 91868 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221303112 is about 34947.1474086226. The cubic root of 1221303112 is about 1068.9100357364.

Adding to 1221303112 its reverse (2113031221), we get a palindrome (3334334333).

The spelling of 1221303112 in words is "one billion, two hundred twenty-one million, three hundred three thousand, one hundred twelve".