1221000012112 has 10 divisors (see below), whose sum is σ = 2365687523498. Its totient is φ = 610500006048.

The previous prime is 1221000012073. The next prime is 1221000012139. The reversal of 1221000012112 is 2112100001221.

It can be written as a sum of positive squares in only one way, i.e., 1220706780736 + 293231376 = 1104856^2 + 17124^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221000012092 and 1221000012101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38156250363 + ... + 38156250394.

Almost surely, 2^{1221000012112} is an apocalyptic number.

It is an amenable number.

1221000012112 is a deficient number, since it is larger than the sum of its proper divisors (1144687511386).

1221000012112 is an equidigital number, since it uses as much as digits as its factorization.

1221000012112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76312500765 (or 76312500759 counting only the distinct ones).

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

Adding to 1221000012112 its reverse (2112100001221), we get a palindrome (3333100013333).

The spelling of 1221000012112 in words is "one trillion, two hundred twenty-one billion, twelve thousand, one hundred twelve".