1221021196 has 24 divisors (see below), whose sum is σ = 2151593136. Its totient is φ = 606294720.

The previous prime is 1221021173. The next prime is 1221021203. The reversal of 1221021196 is 6911201221.

It is a happy number.

It is a super-2 number, since 2×1221021196² = 2981785522162540832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221021196.

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, 417130 + ... + 420046.

It is an arithmetic number, because the mean of its divisors is an integer number (89649714).

Almost surely, 2^1221021196 is an apocalyptic number.

It is an amenable number.

1221021196 is a deficient number, since it is larger than the sum of its proper divisors (930571940).

1221021196 is a wasteful number, since it uses less digits than its factorization.

1221021196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609 (or 3607 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1221021196 is about 34943.1137135774. The cubic root of 1221021196 is about 1068.8277831468.

The spelling of 1221021196 in words is "one billion, two hundred twenty-one million, twenty-one thousand, one hundred ninety-six".