1221121111012 has 24 divisors (see below), whose sum is σ = 2388090513312. Its totient is φ = 541517121600.

The previous prime is 1221121110871. The next prime is 1221121111033. The reversal of 1221121111012 is 2101111211221.

It is a super-2 number, since 2×1221121111012² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338446398 + ... + 338450005.

It is an arithmetic number, because the mean of its divisors is an integer number (99503771388).

Almost surely, 2^{1221121111012} is an apocalyptic number.

It is an amenable number.

1221121111012 is a deficient number, since it is larger than the sum of its proper divisors (1166969402300).

1221121111012 is a wasteful number, since it uses less digits than its factorization.

1221121111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676896459 (or 676896457 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1221121111012 its reverse (2101111211221), we get a palindrome (3322232322233).

The spelling of 1221121111012 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, twelve".