201210202121221 has 16 divisors (see below), whose sum is σ = 213782356200960. Its totient is φ = 188836307426160.

The previous prime is 201210202121197. The next prime is 201210202121237. The reversal of 201210202121221 is 122121202012102.

It is a cyclic number.

It is not a de Polignac number, because 201210202121221 - 2²⁹ = 201209665250309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201210202121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171959670 + ... + 173125816.

It is an arithmetic number, because the mean of its divisors is an integer number (13361397262560).

Almost surely, 2^{201210202121221} is an apocalyptic number.

It is an amenable number.

201210202121221 is a deficient number, since it is larger than the sum of its proper divisors (12572154079739).

201210202121221 is a wasteful number, since it uses less digits than its factorization.

201210202121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251144.

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

Adding to 201210202121221 its reverse (122121202012102), we get a palindrome (323331404133323).

The spelling of 201210202121221 in words is "two hundred one trillion, two hundred ten billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".