1221100120012 has 36 divisors (see below), whose sum is σ = 2208486789768. Its totient is φ = 590746564800.

The previous prime is 1221100120001. The next prime is 1221100120021. The reversal of 1221100120012 is 2100210011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221100119974 and 1221100120001.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23387728 + ... + 23439880.

Almost surely, 2^{1221100120012} is an apocalyptic number.

It is an amenable number.

1221100120012 is a deficient number, since it is larger than the sum of its proper divisors (987386669756).

1221100120012 is a wasteful number, since it uses less digits than its factorization.

1221100120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58310 (or 58277 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221100120012 its reverse (2100210011221), we get a palindrome (3321310131233).

The spelling of 1221100120012 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty thousand, twelve".