1221100121212 has 6 divisors (see below), whose sum is σ = 2136925212128. Its totient is φ = 610550060604.

The previous prime is 1221100121203. The next prime is 1221100121261. The reversal of 1221100121212 is 2121210011221.

It is a super-2 number, since 2×1221100121212² (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 as a sum of consecutive naturals, namely, 152637515148 + ... + 152637515155.

Almost surely, 2^{1221100121212} is an apocalyptic number.

It is an amenable number.

1221100121212 is a deficient number, since it is larger than the sum of its proper divisors (915825090916).

1221100121212 is a wasteful number, since it uses less digits than its factorization.

1221100121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305275030307 (or 305275030305 counting only the distinct ones).

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

Adding to 1221100121212 its reverse (2121210011221), we get a palindrome (3342310132433).

The spelling of 1221100121212 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, two hundred twelve".