221222213212021 has 64 divisors (see below), whose sum is σ = 274912780032000. Its totient is φ = 173720539938816.

The previous prime is 221222213212019. The next prime is 221222213212043. The reversal of 221222213212021 is 120212312222122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221222213212021 - 2¹ = 221222213212019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222213212081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1697087955 + ... + 1697218303.

It is an arithmetic number, because the mean of its divisors is an integer number (4295512188000).

Almost surely, 2^{221222213212021} is an apocalyptic number.

It is an amenable number.

221222213212021 is a deficient number, since it is larger than the sum of its proper divisors (53690566819979).

221222213212021 is a wasteful number, since it uses less digits than its factorization.

221222213212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132998.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 221222213212021 its reverse (120212312222122), we get a palindrome (341434525434143).

The spelling of 221222213212021 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred thirteen million, two hundred twelve thousand, twenty-one".