1221163250 has 64 divisors (see below), whose sum is σ = 2416901760. Its totient is φ = 460728000.

The previous prime is 1221163243. The next prime is 1221163289. The reversal of 1221163250 is 523611221.

It is a super-3 number, since 3×1221163250³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1505345 + ... + 1506155.

It is an arithmetic number, because the mean of its divisors is an integer number (37764090).

Almost surely, 2^1221163250 is an apocalyptic number.

1221163250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221163250 is a deficient number, since it is larger than the sum of its proper divisors (1195738510).

1221163250 is a wasteful number, since it uses less digits than its factorization.

1221163250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164 (or 1154 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1221163250 is about 34945.1463010244. The cubic root of 1221163250 is about 1068.8692307959.

Adding to 1221163250 its reverse (523611221), we get a palindrome (1744774471).

The spelling of 1221163250 in words is "one billion, two hundred twenty-one million, one hundred sixty-three thousand, two hundred fifty".