202101121221 has 16 divisors (see below), whose sum is σ = 270468134208. Its totient is φ = 134234912000.

The previous prime is 202101121219. The next prime is 202101121231. The reversal of 202101121221 is 122121101202.

It is a cyclic number.

It is not a de Polignac number, because 202101121221 - 2¹ = 202101121219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202101121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 893311 + ... + 1096451.

It is an arithmetic number, because the mean of its divisors is an integer number (16904258388).

Almost surely, 2^202101121221 is an apocalyptic number.

It is an amenable number.

202101121221 is a deficient number, since it is larger than the sum of its proper divisors (68367012987).

202101121221 is a wasteful number, since it uses less digits than its factorization.

202101121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204372.

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

Adding to 202101121221 its reverse (122121101202), we get a palindrome (324222222423).

The spelling of 202101121221 in words is "two hundred two billion, one hundred one million, one hundred twenty-one thousand, two hundred twenty-one".