1221221096 has 16 divisors (see below), whose sum is σ = 2292632100. Its totient is φ = 609852544.

The previous prime is 1221221093. The next prime is 1221221119. The reversal of 1221221096 is 6901221221.

It can be written as a sum of positive squares in 2 ways, for example, as 1062108100 + 159112996 = 32590^2 + 12614^2 .

It is not an unprimeable number, because it can be changed into a prime (1221221093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87875 + ... + 100818.

Almost surely, 2^1221221096 is an apocalyptic number.

It is an amenable number.

1221221096 is a deficient number, since it is larger than the sum of its proper divisors (1071411004).

1221221096 is a wasteful number, since it uses less digits than its factorization.

1221221096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189508 (or 189504 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1221221096 is about 34945.9739598140. The cubic root of 1221221096 is about 1068.8861078278.

The spelling of 1221221096 in words is "one billion, two hundred twenty-one million, two hundred twenty-one thousand, ninety-six".