1221000212112 has 40 divisors (see below), whose sum is σ = 3291391879104. Its totient is φ = 389304415104.

The previous prime is 1221000212087. The next prime is 1221000212129. The reversal of 1221000212112 is 2112120001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221000212091 and 1221000212100.

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, 552988123 + ... + 552990330.

Almost surely, 2^{1221000212112} is an apocalyptic number.

1221000212112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221000212112 is an abundant number, since it is smaller than the sum of its proper divisors (2070391666992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221000212112 is a wasteful number, since it uses less digits than its factorization.

1221000212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105978487 (or 1105978481 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221000212112 its reverse (2112120001221), we get a palindrome (3333120213333).

The spelling of 1221000212112 in words is "one trillion, two hundred twenty-one billion, two hundred twelve thousand, one hundred twelve".