1221010100012 has 48 divisors (see below), whose sum is σ = 2162073059328. Its totient is φ = 603315760320.

The previous prime is 1221010099963. The next prime is 1221010100021. The reversal of 1221010100012 is 2100010101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221010099966 and 1221010100002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422932433 + ... + 422935319.

It is an arithmetic number, because the mean of its divisors is an integer number (45043188736).

Almost surely, 2^{1221010100012} is an apocalyptic number.

It is an amenable number.

1221010100012 is a deficient number, since it is larger than the sum of its proper divisors (941062959316).

1221010100012 is a wasteful number, since it uses less digits than its factorization.

1221010100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6006 (or 6004 counting only the distinct ones).

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

Adding to 1221010100012 its reverse (2100010101221), we get a palindrome (3321020201233).

The spelling of 1221010100012 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred thousand, twelve".