1221202101212 has 6 divisors (see below), whose sum is σ = 2137103677128. Its totient is φ = 610601050604.

The previous prime is 1221202101199. The next prime is 1221202101227. The reversal of 1221202101212 is 2121012021221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152650262648 + ... + 152650262655.

It is an arithmetic number, because the mean of its divisors is an integer number (356183946188).

Almost surely, 2^{1221202101212} is an apocalyptic number.

It is an amenable number.

1221202101212 is a deficient number, since it is larger than the sum of its proper divisors (915901575916).

1221202101212 is a wasteful number, since it uses less digits than its factorization.

1221202101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305300525307 (or 305300525305 counting only the distinct ones).

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

Adding to 1221202101212 its reverse (2121012021221), we get a palindrome (3342214122433).

The spelling of 1221202101212 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred one thousand, two hundred twelve".