202011021221221 has 4 divisors (see below), whose sum is σ = 205434936835200. Its totient is φ = 198587105607244.

The previous prime is 202011021221203. The next prime is 202011021221237. The reversal of 202011021221221 is 122122120110202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202011021221221 - 2⁵ = 202011021221189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202011021221281) 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, 1711957806901 + ... + 1711957807018.

It is an arithmetic number, because the mean of its divisors is an integer number (51358734208800).

Almost surely, 2^{202011021221221} is an apocalyptic number.

It is an amenable number.

202011021221221 is a deficient number, since it is larger than the sum of its proper divisors (3423915613979).

202011021221221 is an equidigital number, since it uses as much as digits as its factorization.

202011021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423915613978.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202011021221221 its reverse (122122120110202), we get a palindrome (324133141331423).

The spelling of 202011021221221 in words is "two hundred two trillion, eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".