1221111330372 has 72 divisors (see below), whose sum is σ = 3294918768960. Its totient is φ = 380182904640.

The previous prime is 1221111330371. The next prime is 1221111330389. The reversal of 1221111330372 is 2730331111221.

It is a super-2 number, since 2×1221111330372² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221111330371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12523623 + ... + 12620750.

It is an arithmetic number, because the mean of its divisors is an integer number (45762760680).

Almost surely, 2^{1221111330372} is an apocalyptic number.

1221111330372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221111330372 is an abundant number, since it is smaller than the sum of its proper divisors (2073807438588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221111330372 is a wasteful number, since it uses less digits than its factorization.

1221111330372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25144473 (or 25144468 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

Adding to 1221111330372 its reverse (2730331111221), we get a palindrome (3951442441593).

The spelling of 1221111330372 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, three hundred thirty thousand, three hundred seventy-two".