221222212022021 has 64 divisors (see below), whose sum is σ = 271508473055232. Its totient is φ = 175933827643392.

The previous prime is 221222212021997. The next prime is 221222212022029. The reversal of 221222212022021 is 120220212222122.

It is not a de Polignac number, because 221222212022021 - 2⁶ = 221222212021957 is a prime.

It is a super-2 number, since 2×221222212022021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222212022029) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24079913990 + ... + 24079923176.

It is an arithmetic number, because the mean of its divisors is an integer number (4242319891488).

Almost surely, 2^{221222212022021} is an apocalyptic number.

It is an amenable number.

221222212022021 is a deficient number, since it is larger than the sum of its proper divisors (50286261033211).

221222212022021 is a wasteful number, since it uses less digits than its factorization.

221222212022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14298.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221222212022021 its reverse (120220212222122), we get a palindrome (341442424244143).

The spelling of 221222212022021 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, twenty-two thousand, twenty-one".