1221001000012 has 24 divisors (see below), whose sum is σ = 2284843468320. Its totient is φ = 568899705600.

The previous prime is 1221000999991. The next prime is 1221001000027. The reversal of 1221001000012 is 2100001001221.

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, 88883712 + ... + 88897447.

It is an arithmetic number, because the mean of its divisors is an integer number (95201811180).

Almost surely, 2^{1221001000012} is an apocalyptic number.

It is an amenable number.

1221001000012 is a deficient number, since it is larger than the sum of its proper divisors (1063842468308).

1221001000012 is a wasteful number, since it uses less digits than its factorization.

1221001000012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177781281 (or 177781279 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221001000012 its reverse (2100001001221), we get a palindrome (3321002001233).

The spelling of 1221001000012 in words is "one trillion, two hundred twenty-one billion, one million, twelve", and thus it is an aban number.