200221220021 has 4 divisors (see below), whose sum is σ = 200299771500. Its totient is φ = 200142668544.

The previous prime is 200221219999. The next prime is 200221220119. The reversal of 200221220021 is 120022122002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120022122002 = 2 ⋅60011061001.

It can be written as a sum of positive squares in 2 ways, for example, as 168745137796 + 31476082225 = 410786^2 + 177415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200221220021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200221219978 and 200221220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200221820021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39271916 + ... + 39277013.

It is an arithmetic number, because the mean of its divisors is an integer number (50074942875).

Almost surely, 2^200221220021 is an apocalyptic number.

It is an amenable number.

200221220021 is a deficient number, since it is larger than the sum of its proper divisors (78551479).

200221220021 is an equidigital number, since it uses as much as digits as its factorization.

200221220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78551478.

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

Adding to 200221220021 its reverse (120022122002), we get a palindrome (320243342023).

The spelling of 200221220021 in words is "two hundred billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".