1221201011212 has 24 divisors (see below), whose sum is σ = 2630279101856. Its totient is φ = 483112487808.

The previous prime is 1221201011203. The next prime is 1221201011237. The reversal of 1221201011212 is 2121101021221.

It is a super-2 number, since 2×1221201011212² (a number of 25 digits) contains 22 as substring.

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, 1677473553 + ... + 1677474280.

Almost surely, 2^{1221201011212} is an apocalyptic number.

It is an amenable number.

1221201011212 is an abundant number, since it is smaller than the sum of its proper divisors (1409078090644).

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

1221201011212 is a wasteful number, since it uses less digits than its factorization.

1221201011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354947857 (or 3354947855 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221201011212 its reverse (2121101021221), we get a palindrome (3342302032433).

The spelling of 1221201011212 in words is "one trillion, two hundred twenty-one billion, two hundred one million, eleven thousand, two hundred twelve".