221222200100021 has 8 divisors (see below), whose sum is σ = 221303631372600. Its totient is φ = 221140772533440.

The previous prime is 221222200099973. The next prime is 221222200100051. The reversal of 221222200100021 is 120001002222122.

It is a happy number.

221222200100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 142930034962225 + 78292165137796 = 11955335^2 + 8848286^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221222200100021 - 2¹⁴ = 221222200083637 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 (221222200100051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121451435 + ... + 123259463.

It is an arithmetic number, because the mean of its divisors is an integer number (27662953921575).

Almost surely, 2^{221222200100021} is an apocalyptic number.

It is an amenable number.

221222200100021 is a deficient number, since it is larger than the sum of its proper divisors (81431272579).

221222200100021 is a wasteful number, since it uses less digits than its factorization.

221222200100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852999.

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

Adding to 221222200100021 its reverse (120001002222122), we get a palindrome (341223202322143).

The spelling of 221222200100021 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred million, one hundred thousand, twenty-one".