220100220221 has 12 divisors (see below), whose sum is σ = 256147721532. Its totient is φ = 188574236928.

The previous prime is 220100220211. The next prime is 220100220229. The reversal of 220100220221 is 122022001022.

It can be written as a sum of positive squares in 2 ways, for example, as 113131322500 + 106968897721 = 336350^2 + 327061^2 .

It is a de Polignac number, because none of the positive numbers 2^k-220100220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220100220196 and 220100220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220100220229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 876710 + ... + 1099463.

It is an arithmetic number, because the mean of its divisors is an integer number (21345643461).

Almost surely, 2^220100220221 is an apocalyptic number.

It is an amenable number.

220100220221 is a deficient number, since it is larger than the sum of its proper divisors (36047501311).

220100220221 is a wasteful number, since it uses less digits than its factorization.

220100220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978460 (or 1978453 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 220100220221 its reverse (122022001022), we get a palindrome (342122221243).

The spelling of 220100220221 in words is "two hundred twenty billion, one hundred million, two hundred twenty thousand, two hundred twenty-one".