220206240021 has 16 divisors (see below), whose sum is σ = 298443755520. Its totient is φ = 144386800320.

The previous prime is 220206240017. The next prime is 220206240043. The reversal of 220206240021 is 120042602022.

It is not a de Polignac number, because 220206240021 - 2² = 220206240017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220206240021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220206240061) 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, 2981740 + ... + 3054698.

It is an arithmetic number, because the mean of its divisors is an integer number (18652734720).

Almost surely, 2^220206240021 is an apocalyptic number.

It is an amenable number.

220206240021 is a deficient number, since it is larger than the sum of its proper divisors (78237515499).

220206240021 is a wasteful number, since it uses less digits than its factorization.

220206240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89516.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 220206240021 its reverse (120042602022), we get a palindrome (340248842043).

The spelling of 220206240021 in words is "two hundred twenty billion, two hundred six million, two hundred forty thousand, twenty-one".