1221012112112 has 40 divisors (see below), whose sum is σ = 2548027999104. Its totient is φ = 563469007104.

The previous prime is 1221012112081. The next prime is 1221012112129. The reversal of 1221012112112 is 2112112101221.

It is a congruent number.

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, 1190198 + ... + 1964330.

Almost surely, 2^{1221012112112} is an apocalyptic number.

It is an amenable number.

1221012112112 is an abundant number, since it is smaller than the sum of its proper divisors (1327015886992).

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

1221012112112 is a wasteful number, since it uses less digits than its factorization.

1221012112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781737 (or 781731 counting only the distinct ones).

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

Adding to 1221012112112 its reverse (2112112101221), we get a palindrome (3333124213333).

The spelling of 1221012112112 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred twelve thousand, one hundred twelve".