221222102021 has 16 divisors (see below), whose sum is σ = 230465737920. Its totient is φ = 212199886080.

The previous prime is 221222101981. The next prime is 221222102029. The reversal of 221222102021 is 120201222122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221222102021 - 2³⁴ = 204042232837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222102029) 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 15 ways as a sum of consecutive naturals, for example, 320786 + ... + 738476.

It is an arithmetic number, because the mean of its divisors is an integer number (14404108620).

Almost surely, 2^221222102021 is an apocalyptic number.

It is an amenable number.

221222102021 is a deficient number, since it is larger than the sum of its proper divisors (9243635899).

221222102021 is a wasteful number, since it uses less digits than its factorization.

221222102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417956.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221222102021 its reverse (120201222122), we get a palindrome (341423324143).

The spelling of 221222102021 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred two thousand, twenty-one".