201021022221121 has 8 divisors (see below), whose sum is σ = 201377046673800. Its totient is φ = 200665007370240.

The previous prime is 201021022221043. The next prime is 201021022221181. The reversal of 201021022221121 is 121122220120102.

It can be written as a sum of positive squares in 4 ways, for example, as 8327201004721 + 192693821216400 = 2885689^2 + 13881420^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021022221121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201021022221181) 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, 40176225 + ... + 44901793.

It is an arithmetic number, because the mean of its divisors is an integer number (25172130834225).

Almost surely, 2^{201021022221121} is an apocalyptic number.

It is an amenable number.

201021022221121 is a deficient number, since it is larger than the sum of its proper divisors (356024452679).

201021022221121 is an equidigital number, since it uses as much as digits as its factorization.

201021022221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800899.

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

Adding to 201021022221121 its reverse (121122220120102), we get a palindrome (322143242341223).

The spelling of 201021022221121 in words is "two hundred one trillion, twenty-one billion, twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".