1221112012112 has 10 divisors (see below), whose sum is σ = 2365904523498. Its totient is φ = 610556006048.

The previous prime is 1221112012093. The next prime is 1221112012121. The reversal of 1221112012112 is 2112102111221.

It can be written as a sum of positive squares in only one way, i.e., 744189176896 + 476922835216 = 862664^2 + 690596^2 .

It is a super-2 number, since 2×1221112012112² (a number of 25 digits) contains 22 as substring.

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, 38159750363 + ... + 38159750394.

Almost surely, 2^{1221112012112} is an apocalyptic number.

It is an amenable number.

1221112012112 is a deficient number, since it is larger than the sum of its proper divisors (1144792511386).

1221112012112 is an equidigital number, since it uses as much as digits as its factorization.

1221112012112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76319500765 (or 76319500759 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221112012112 its reverse (2112102111221), we get a palindrome (3333214123333).

The spelling of 1221112012112 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, twelve thousand, one hundred twelve".