1221155032 has 32 divisors (see below), whose sum is σ = 2315653200. Its totient is φ = 603684864.

The previous prime is 1221155021. The next prime is 1221155041. The reversal of 1221155032 is 2305511221.

It is a super-2 number, since 2×1221155032² = 2982439224357842048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221154994 and 1221155012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283648 + ... + 287920.

Almost surely, 2^1221155032 is an apocalyptic number.

It is an amenable number.

1221155032 is a deficient number, since it is larger than the sum of its proper divisors (1094498168).

1221155032 is a wasteful number, since it uses less digits than its factorization.

1221155032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675 (or 4671 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1221155032 is about 34945.0287165428. The cubic root of 1221155032 is about 1068.8668330856.

Adding to 1221155032 its reverse (2305511221), we get a palindrome (3526666253).

The spelling of 1221155032 in words is "one billion, two hundred twenty-one million, one hundred fifty-five thousand, thirty-two".