202101120021221 has 4 divisors (see below), whose sum is σ = 203555084913600. Its totient is φ = 200647155128844.

The previous prime is 202101120021209. The next prime is 202101120021253. The reversal of 202101120021221 is 122120021101202.

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 202101120021221 - 2¹⁴ = 202101120004837 is a prime.

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 202101120021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101120021271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726982445981 + ... + 726982446258.

It is an arithmetic number, because the mean of its divisors is an integer number (50888771228400).

Almost surely, 2^{202101120021221} is an apocalyptic number.

It is an amenable number.

202101120021221 is a deficient number, since it is larger than the sum of its proper divisors (1453964892379).

202101120021221 is a wasteful number, since it uses less digits than its factorization.

202101120021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453964892378.

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

Adding to 202101120021221 its reverse (122120021101202), we get a palindrome (324221141122423).

The spelling of 202101120021221 in words is "two hundred two trillion, one hundred one billion, one hundred twenty million, twenty-one thousand, two hundred twenty-one".