1221040552 has 16 divisors (see below), whose sum is σ = 2351328660. Its totient is φ = 594019584.

The previous prime is 1221040549. The next prime is 1221040591. The reversal of 1221040552 is 2550401221.

It can be written as a sum of positive squares in 2 ways, for example, as 901560676 + 319479876 = 30026^2 + 17874^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062273 + ... + 2062864.

Almost surely, 2^1221040552 is an apocalyptic number.

It is an amenable number.

1221040552 is a deficient number, since it is larger than the sum of its proper divisors (1130288108).

1221040552 is a wasteful number, since it uses less digits than its factorization.

1221040552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4125180 (or 4125176 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1221040552 is about 34943.3906769220. The cubic root of 1221040552 is about 1068.8334309115.

Adding to 1221040552 its reverse (2550401221), we get a palindrome (3771441773).

The spelling of 1221040552 in words is "one billion, two hundred twenty-one million, forty thousand, five hundred fifty-two".