220201202021 has 4 divisors (see below), whose sum is σ = 222381412044. Its totient is φ = 218020992000.

The previous prime is 220201201963. The next prime is 220201202029. The reversal of 220201202021 is 120202102022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196327861921 + 23873340100 = 443089^2 + 154510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220201202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220201201987 and 220201202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220201202029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090104860 + ... + 1090105061.

It is an arithmetic number, because the mean of its divisors is an integer number (55595353011).

Almost surely, 2^220201202021 is an apocalyptic number.

It is an amenable number.

220201202021 is a deficient number, since it is larger than the sum of its proper divisors (2180210023).

220201202021 is a wasteful number, since it uses less digits than its factorization.

220201202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180210022.

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

Adding to 220201202021 its reverse (120202102022), we get a palindrome (340403304043).

Subtracting from 220201202021 its reverse (120202102022), we obtain a palindrome (99999099999).

The spelling of 220201202021 in words is "two hundred twenty billion, two hundred one million, two hundred two thousand, twenty-one".