221020110022221 has 16 divisors (see below), whose sum is σ = 327569927006400. Its totient is φ = 147287012876784.

The previous prime is 221020110022181. The next prime is 221020110022249. The reversal of 221020110022221 is 122220011020122.

It is a happy number.

221020110022221 is a `hidden beast` number, since 2 + 210 + 201 + 10 + 0 + 22 + 221 = 666.

It is not a de Polignac number, because 221020110022221 - 2³⁴ = 221002930153037 is a prime.

It is a super-2 number, since 2×221020110022221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221020110022194 and 221020110022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020110022121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1659019326 + ... + 1659152543.

It is an arithmetic number, because the mean of its divisors is an integer number (20473120437900).

Almost surely, 2^{221020110022221} is an apocalyptic number.

It is an amenable number.

221020110022221 is a deficient number, since it is larger than the sum of its proper divisors (106549816984179).

221020110022221 is a wasteful number, since it uses less digits than its factorization.

221020110022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318174345 (or 3318174339 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221020110022221 its reverse (122220011020122), we get a palindrome (343240121042343).

The spelling of 221020110022221 in words is "two hundred twenty-one trillion, twenty billion, one hundred ten million, twenty-two thousand, two hundred twenty-one".