1221011222012 has 24 divisors (see below), whose sum is σ = 2153027058000. Its totient is φ = 605867936256.

The previous prime is 1221011221973. The next prime is 1221011222017. The reversal of 1221011222012 is 2102221101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011222017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242837 + ... + 1581452.

It is an arithmetic number, because the mean of its divisors is an integer number (89709460750).

Almost surely, 2^{1221011222012} is an apocalyptic number.

It is an amenable number.

1221011222012 is a deficient number, since it is larger than the sum of its proper divisors (932015835988).

1221011222012 is a wasteful number, since it uses less digits than its factorization.

1221011222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825565 (or 1825563 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221011222012 its reverse (2102221101221), we get a palindrome (3323232323233).

The spelling of 1221011222012 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred twenty-two thousand, twelve".