1212011101221 has 16 divisors (see below), whose sum is σ = 1759725739200. Its totient is φ = 739084808448.

The previous prime is 1212011101219. The next prime is 1212011101247. The reversal of 1212011101221 is 1221011102121.

It is a happy number.

It is not a de Polignac number, because 1212011101221 - 2¹ = 1212011101219 is a prime.

It is a super-2 number, since 2×1212011101221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212011101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212011101321) 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, 366607876 + ... + 366611181.

It is an arithmetic number, because the mean of its divisors is an integer number (109982858700).

Almost surely, 2^{1212011101221} is an apocalyptic number.

It is an amenable number.

1212011101221 is a deficient number, since it is larger than the sum of its proper divisors (547714637979).

1212011101221 is a wasteful number, since it uses less digits than its factorization.

1212011101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733219108.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212011101221 its reverse (1221011102121), we get a palindrome (2433022203342).

The spelling of 1212011101221 in words is "one trillion, two hundred twelve billion, eleven million, one hundred one thousand, two hundred twenty-one".