1221011211212 has 48 divisors (see below), whose sum is σ = 2304078799680. Its totient is φ = 562823559168.

The previous prime is 1221011211179. The next prime is 1221011211271. The reversal of 1221011211212 is 2121121101221.

It is a super-5 number, since 5×1221011211212⁵ (a number of 62 digits) contains 55555 as substring. Note that it is a super-d number also for d = 3.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243760964 + ... + 243765972.

It is an arithmetic number, because the mean of its divisors is an integer number (48001641660).

Almost surely, 2^{1221011211212} is an apocalyptic number.

It is an amenable number.

1221011211212 is a deficient number, since it is larger than the sum of its proper divisors (1083067588468).

1221011211212 is a wasteful number, since it uses less digits than its factorization.

1221011211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10082 (or 10080 counting only the distinct ones).

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

Adding to 1221011211212 its reverse (2121121101221), we get a palindrome (3342132312433).

The spelling of 1221011211212 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred eleven thousand, two hundred twelve".