220010021 has 16 divisors (see below), whose sum is σ = 274658688. Its totient is φ = 171211200.

The previous prime is 220009963. The next prime is 220010033. The reversal of 220010021 is 120010022.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220010021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220009990 and 220010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220010041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80351 + ... + 83043.

It is an arithmetic number, because the mean of its divisors is an integer number (17166168).

Almost surely, 2^220010021 is an apocalyptic number.

It is an amenable number.

220010021 is a deficient number, since it is larger than the sum of its proper divisors (54648667).

220010021 is a wasteful number, since it uses less digits than its factorization.

220010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3772.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 220010021 is about 14832.7347781857. The cubic root of 220010021 is about 603.6902394316.

Adding to 220010021 its reverse (120010022), we get a palindrome (340020043).

Subtracting from 220010021 its reverse (120010022), we obtain a palindrome (99999999).

It can be divided in two parts, 2200 and 10021, that added together give a palindrome (12221).

The spelling of 220010021 in words is "two hundred twenty million, ten thousand, twenty-one".