201012020122121 has 6 divisors (see below), whose sum is σ = 217663903446030. Its totient is φ = 185549557035648.

The previous prime is 201012020122103. The next prime is 201012020122157. The reversal of 201012020122121 is 121221020210102.

It can be written as a sum of positive squares in 3 ways, for example, as 33906066496 + 200978114055625 = 184136^2 + 14176675^2 .

It is not a de Polignac number, because 201012020122121 - 2¹⁸ = 201012019859977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201012020122121.

It is not an unprimeable number, because it can be changed into a prime (201012020122321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594710118536 + ... + 594710118873.

It is an arithmetic number, because the mean of its divisors is an integer number (36277317241005).

Almost surely, 2^{201012020122121} is an apocalyptic number.

It is an amenable number.

201012020122121 is a deficient number, since it is larger than the sum of its proper divisors (16651883323909).

201012020122121 is a wasteful number, since it uses less digits than its factorization.

201012020122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189420237435 (or 1189420237422 counting only the distinct ones).

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

Adding to 201012020122121 its reverse (121221020210102), we get a palindrome (322233040332223).

The spelling of 201012020122121 in words is "two hundred one trillion, twelve billion, twenty million, one hundred twenty-two thousand, one hundred twenty-one".