1001212012221 has 16 divisors (see below), whose sum is σ = 1338622418880. Its totient is φ = 665639331840.

The previous prime is 1001212012201. The next prime is 1001212012243. The reversal of 1001212012221 is 1222102121001.

It is not a de Polignac number, because 1001212012221 - 2¹⁰ = 1001212011197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001212012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001212012201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3248806 + ... + 3543608.

It is an arithmetic number, because the mean of its divisors is an integer number (83663901180).

Almost surely, 2^{1001212012221} is an apocalyptic number.

It is an amenable number.

1001212012221 is a deficient number, since it is larger than the sum of its proper divisors (337410406659).

1001212012221 is a wasteful number, since it uses less digits than its factorization.

1001212012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297916.

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

Adding to 1001212012221 its reverse (1222102121001), we get a palindrome (2223314133222).

The spelling of 1001212012221 in words is "one trillion, one billion, two hundred twelve million, twelve thousand, two hundred twenty-one".