1212011020221 has 16 divisors (see below), whose sum is σ = 1646553073536. Its totient is φ = 792739037376.

The previous prime is 1212011020193. The next prime is 1212011020229. The reversal of 1212011020221 is 1220201102121.

It is not a de Polignac number, because 1212011020221 - 2¹¹ = 1212011018173 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212011020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212011020229) 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, 6758511 + ... + 6935523.

It is an arithmetic number, because the mean of its divisors is an integer number (102909567096).

Almost surely, 2^{1212011020221} is an apocalyptic number.

It is an amenable number.

1212011020221 is a deficient number, since it is larger than the sum of its proper divisors (434542053315).

1212011020221 is a wasteful number, since it uses less digits than its factorization.

1212011020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220132.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1212011020221 its reverse (1220201102121), we get a palindrome (2432212122342).

The spelling of 1212011020221 in words is "one trillion, two hundred twelve billion, eleven million, twenty thousand, two hundred twenty-one".