1281221032 has 48 divisors (see below), whose sum is σ = 3009473460. Its totient is φ = 506854656.

The previous prime is 1281221023. The next prime is 1281221033. The reversal of 1281221032 is 2301221821.

It can be written as a sum of positive squares in 2 ways, for example, as 1275489796 + 5731236 = 35714^2 + 2394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1281220994 and 1281221012.

It is not an unprimeable number, because it can be changed into a prime (1281221033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120613 + ... + 130804.

Almost surely, 2^1281221032 is an apocalyptic number.

It is an amenable number.

1281221032 is an abundant number, since it is smaller than the sum of its proper divisors (1728252428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281221032 is a wasteful number, since it uses less digits than its factorization.

1281221032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251450 (or 251439 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1281221032 is about 35794.1480133275. The cubic root of 1281221032 is about 1086.1121859535.

Adding to 1281221032 its reverse (2301221821), we get a palindrome (3582442853).

The spelling of 1281221032 in words is "one billion, two hundred eighty-one million, two hundred twenty-one thousand, thirty-two".