202101001021221 has 16 divisors (see below), whose sum is σ = 273658837478400. Its totient is φ = 132641066823408.

The previous prime is 202101001021207. The next prime is 202101001021243. The reversal of 202101001021221 is 122120100101202.

It is not a de Polignac number, because 202101001021221 - 2¹⁹ = 202101000496933 is a prime.

It is a super-3 number, since 3×202101001021221³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 202101001021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101001021021) 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 15 ways as a sum of consecutive naturals, for example, 310198861 + ... + 310849698.

It is an arithmetic number, because the mean of its divisors is an integer number (17103677342400).

Almost surely, 2^{202101001021221} is an apocalyptic number.

It is an amenable number.

202101001021221 is a deficient number, since it is larger than the sum of its proper divisors (71557836457179).

202101001021221 is a wasteful number, since it uses less digits than its factorization.

202101001021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621050248.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 202101001021221 its reverse (122120100101202), we get a palindrome (324221101122423).

The spelling of 202101001021221 in words is "two hundred two trillion, one hundred one billion, one million, twenty-one thousand, two hundred twenty-one".