202120200011221 has 8 divisors (see below), whose sum is σ = 207972737099064. Its totient is φ = 196343179531200.

The previous prime is 202120200011189. The next prime is 202120200011299. The reversal of 202120200011221 is 122110002021202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 110090982380625 + 92029217630596 = 10492425^2 + 9593186^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202120200011221 - 2⁵ = 202120200011189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202120200011195 and 202120200011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120201011221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18879146526 + ... + 18879157231.

It is an arithmetic number, because the mean of its divisors is an integer number (25996592137383).

Almost surely, 2^{202120200011221} is an apocalyptic number.

It is an amenable number.

202120200011221 is a deficient number, since it is larger than the sum of its proper divisors (5852537087843).

202120200011221 is a wasteful number, since it uses less digits than its factorization.

202120200011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37758303911.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202120200011221 its reverse (122110002021202), we get a palindrome (324230202032423).

The spelling of 202120200011221 in words is "two hundred two trillion, one hundred twenty billion, two hundred million, eleven thousand, two hundred twenty-one".