220221220021 has 16 divisors (see below), whose sum is σ = 254537726400. Its totient is φ = 188302682880.

The previous prime is 220221220007. The next prime is 220221220039. The reversal of 220221220021 is 120022122022.

It is a cyclic number.

It is not a de Polignac number, because 220221220021 - 2¹⁷ = 220221088949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220221219977 and 220221220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221220091) 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, 90471 + ... + 669796.

It is an arithmetic number, because the mean of its divisors is an integer number (15908607900).

Almost surely, 2^220221220021 is an apocalyptic number.

It is an amenable number.

220221220021 is a deficient number, since it is larger than the sum of its proper divisors (34316506379).

220221220021 is a wasteful number, since it uses less digits than its factorization.

220221220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761844.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 220221220021 its reverse (120022122022), we get a palindrome (340243342043).

The spelling of 220221220021 in words is "two hundred twenty billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".