1221000221132 has 24 divisors (see below), whose sum is σ = 2142523680192. Its totient is φ = 608851232000.

The previous prime is 1221000221107. The next prime is 1221000221141. The reversal of 1221000221132 is 2311220001221.

It is a super-2 number, since 2×1221000221132² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221000221132.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7900157 + ... + 8053227.

It is an arithmetic number, because the mean of its divisors is an integer number (89271820008).

Almost surely, 2^{1221000221132} is an apocalyptic number.

It is an amenable number.

1221000221132 is a deficient number, since it is larger than the sum of its proper divisors (921523459060).

1221000221132 is a wasteful number, since it uses less digits than its factorization.

1221000221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158449 (or 158447 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221000221132 its reverse (2311220001221), we get a palindrome (3532220222353).

The spelling of 1221000221132 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one thousand, one hundred thirty-two".