202201101021221 has 4 divisors (see below), whose sum is σ = 214095283434252. Its totient is φ = 190306918608192.

The previous prime is 202201101021181. The next prime is 202201101021239. The reversal of 202201101021221 is 122120101102202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91853324352196 + 110347776669025 = 9584014^2 + 10504655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202201101021221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 11894182413013 = 202201101021221 / (2 + 0 + 2 + 2 + 0 + 1 + 1 + 0 + 1 + 0 + 2 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202201101021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202201101021421) 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, 5947091206490 + ... + 5947091206523.

It is an arithmetic number, because the mean of its divisors is an integer number (53523820858563).

Almost surely, 2^{202201101021221} is an apocalyptic number.

It is an amenable number.

202201101021221 is a deficient number, since it is larger than the sum of its proper divisors (11894182413031).

202201101021221 is a wasteful number, since it uses less digits than its factorization.

202201101021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11894182413030.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202201101021221 its reverse (122120101102202), we get a palindrome (324321202123423).

The spelling of 202201101021221 in words is "two hundred two trillion, two hundred one billion, one hundred one million, twenty-one thousand, two hundred twenty-one".