1221011121212 has 24 divisors (see below), whose sum is σ = 2173491015696. Its totient is φ = 600088364288.

The previous prime is 1221011121193. The next prime is 1221011121223. The reversal of 1221011121212 is 2121211101221.

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, 9268973 + ... + 9399780.

It is an arithmetic number, because the mean of its divisors is an integer number (90562125654).

Almost surely, 2^{1221011121212} is an apocalyptic number.

It is an amenable number.

1221011121212 is a deficient number, since it is larger than the sum of its proper divisors (952479894484).

1221011121212 is a wasteful number, since it uses less digits than its factorization.

1221011121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18669037 (or 18669035 counting only the distinct ones).

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

Adding to 1221011121212 its reverse (2121211101221), we get a palindrome (3342222222433).

The spelling of 1221011121212 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, two hundred twelve".