1221101000012 has 24 divisors (see below), whose sum is σ = 2169445074720. Its totient is φ = 601326633600.

The previous prime is 1221100999997. The next prime is 1221101000017. The reversal of 1221101000012 is 2100001011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221100999957 and 1221101000002.

It is not an unprimeable number, because it can be changed into a prime (1221101000017) 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 7 ways as a sum of consecutive naturals, for example, 8312489 + ... + 8458112.

It is an arithmetic number, because the mean of its divisors is an integer number (90393544780).

Almost surely, 2^{1221101000012} is an apocalyptic number.

It is an amenable number.

1221101000012 is a deficient number, since it is larger than the sum of its proper divisors (948344074708).

1221101000012 is a wasteful number, since it uses less digits than its factorization.

1221101000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16770881 (or 16770879 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221101000012 its reverse (2100001011221), we get a palindrome (3321102011233).

The spelling of 1221101000012 in words is "one trillion, two hundred twenty-one billion, one hundred one million, twelve", and thus it is an aban number.