1221112101212 has 12 divisors (see below), whose sum is σ = 2136962303616. Its totient is φ = 610551443040.

The previous prime is 1221112101199. The next prime is 1221112101271. The reversal of 1221112101212 is 2121012111221.

It is a super-2 number, since 2×1221112101212² (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 in 3 ways as a sum of consecutive naturals, for example, 516668 + ... + 1645955.

It is an arithmetic number, because the mean of its divisors is an integer number (178080191968).

Almost surely, 2^{1221112101212} is an apocalyptic number.

It is an amenable number.

1221112101212 is a deficient number, since it is larger than the sum of its proper divisors (915850202404).

1221112101212 is a wasteful number, since it uses less digits than its factorization.

1221112101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303788 (or 2303786 counting only the distinct ones).

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

Adding to 1221112101212 its reverse (2121012111221), we get a palindrome (3342124212433).

The spelling of 1221112101212 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred one thousand, two hundred twelve".