221020222022221 has 8 divisors (see below), whose sum is σ = 225683282411064. Its totient is φ = 216401361258240.

The previous prime is 221020222022219. The next prime is 221020222022231. The reversal of 221020222022221 is 122220222020122.

It can be written as a sum of positive squares in 4 ways, for example, as 62896161104100 + 158124060918121 = 7930710^2 + 12574739^2 .

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 221020222022221 - 2¹ = 221020222022219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020222022192 and 221020222022201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020222022231) 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, 11049896110 + ... + 11049916111.

It is an arithmetic number, because the mean of its divisors is an integer number (28210410301383).

Almost surely, 2^{221020222022221} is an apocalyptic number.

It is an amenable number.

221020222022221 is a deficient number, since it is larger than the sum of its proper divisors (4663060388843).

221020222022221 is a wasteful number, since it uses less digits than its factorization.

221020222022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22099812431.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 221020222022221 its reverse (122220222020122), we get a palindrome (343240444042343).

The spelling of 221020222022221 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty-two million, twenty-two thousand, two hundred twenty-one".