202020020111221 has 8 divisors (see below), whose sum is σ = 217664167222040. Its totient is φ = 186390750938112.

The previous prime is 202020020111213. The next prime is 202020020111383. The reversal of 202020020111221 is 122111020020202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 60079721734321 + 141940298376900 = 7751111^2 + 11913870^2 .

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 202020020111221 - 2³ = 202020020111213 is a prime.

It is a super-2 number, since 2×202020020111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202020020111195 and 202020020111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020020114221) 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, 3719456220 + ... + 3719510533.

It is an arithmetic number, because the mean of its divisors is an integer number (27208020902755).

Almost surely, 2^{202020020111221} is an apocalyptic number.

It is an amenable number.

202020020111221 is a deficient number, since it is larger than the sum of its proper divisors (15644147110819).

202020020111221 is a wasteful number, since it uses less digits than its factorization.

202020020111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7438968855.

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

Adding to 202020020111221 its reverse (122111020020202), we get a palindrome (324131040131423).

The spelling of 202020020111221 in words is "two hundred two trillion, twenty billion, twenty million, one hundred eleven thousand, two hundred twenty-one".