1212201101221 has 16 divisors (see below), whose sum is σ = 1392175713600. Its totient is φ = 1043870112000.

The previous prime is 1212201101213. The next prime is 1212201101249. The reversal of 1212201101221 is 1221011022121.

It is a cyclic number.

It is not a de Polignac number, because 1212201101221 - 2³ = 1212201101213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212201101195 and 1212201101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212201101291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1327021 + ... + 2045821.

It is an arithmetic number, because the mean of its divisors is an integer number (87010982100).

Almost surely, 2^{1212201101221} is an apocalyptic number.

1212201101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212201101221 is a deficient number, since it is larger than the sum of its proper divisors (179974612379).

1212201101221 is a wasteful number, since it uses less digits than its factorization.

1212201101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726900.

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

Adding to 1212201101221 its reverse (1221011022121), we get a palindrome (2433212123342).

The spelling of 1212201101221 in words is "one trillion, two hundred twelve billion, two hundred one million, one hundred one thousand, two hundred twenty-one".