2221011001221 has 64 divisors (see below), whose sum is σ = 3132021945600. Its totient is φ = 1398053888000.

The previous prime is 2221011001217. The next prime is 2221011001241. The reversal of 2221011001221 is 1221001101222.

It is a cyclic number.

It is not a de Polignac number, because 2221011001221 - 2² = 2221011001217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2221011001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221011001211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 298078546 + ... + 298085996.

It is an arithmetic number, because the mean of its divisors is an integer number (48937842900).

Almost surely, 2^{2221011001221} is an apocalyptic number.

It is an amenable number.

2221011001221 is a deficient number, since it is larger than the sum of its proper divisors (911010944379).

2221011001221 is a wasteful number, since it uses less digits than its factorization.

2221011001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7990.

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

Adding to 2221011001221 its reverse (1221001101222), we get a palindrome (3442012102443).

The spelling of 2221011001221 in words is "two trillion, two hundred twenty-one billion, eleven million, one thousand, two hundred twenty-one".