2212012011221 has 4 divisors (see below), whose sum is σ = 2288288287500. Its totient is φ = 2135735734944.

The previous prime is 2212012011211. The next prime is 2212012011227. The reversal of 2212012011221 is 1221102102122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1505563356196 + 706448655025 = 1227014^2 + 840505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212012011221 - 2³⁸ = 1937134104277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2212012011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212012011227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38138138096 + ... + 38138138153.

It is an arithmetic number, because the mean of its divisors is an integer number (572072071875).

Almost surely, 2^{2212012011221} is an apocalyptic number.

It is an amenable number.

2212012011221 is a deficient number, since it is larger than the sum of its proper divisors (76276276279).

2212012011221 is an equidigital number, since it uses as much as digits as its factorization.

2212012011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76276276278.

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

Adding to 2212012011221 its reverse (1221102102122), we get a palindrome (3433114113343).

Subtracting from 2212012011221 its reverse (1221102102122), we obtain a palindrome (990909909099).

The spelling of 2212012011221 in words is "two trillion, two hundred twelve billion, twelve million, eleven thousand, two hundred twenty-one".