220200021 has 24 divisors (see below), whose sum is σ = 321834240. Its totient is φ = 145073376.

The previous prime is 220200011. The next prime is 220200059. The reversal of 220200021 is 120002022.

It is not a de Polignac number, because 220200021 - 2¹⁰ = 220198997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 220199976 and 220200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220200011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 358911 + ... + 359523.

It is an arithmetic number, because the mean of its divisors is an integer number (13409760).

Almost surely, 2^220200021 is an apocalyptic number.

It is an amenable number.

220200021 is a deficient number, since it is larger than the sum of its proper divisors (101634219).

220200021 is a wasteful number, since it uses less digits than its factorization.

220200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 220200021 is about 14839.1381488279. The cubic root of 220200021 is about 603.8639711284.

Adding to 220200021 its reverse (120002022), we get a palindrome (340202043).

The spelling of 220200021 in words is "two hundred twenty million, two hundred thousand, twenty-one".