201212102121 has 16 divisors (see below), whose sum is σ = 282770429760. Its totient is φ = 127072137920.

The previous prime is 201212102053. The next prime is 201212102173. The reversal of 201212102121 is 121201212102.

It is a cyclic number.

It is not a de Polignac number, because 201212102121 - 2¹¹ = 201212100073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201212102121.

It is not an unprimeable number, because it can be changed into a prime (201212100121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21814095 + ... + 21823316.

It is an arithmetic number, because the mean of its divisors is an integer number (17673151860).

Almost surely, 2^201212102121 is an apocalyptic number.

It is an amenable number.

201212102121 is a deficient number, since it is larger than the sum of its proper divisors (81558327639).

201212102121 is a wasteful number, since it uses less digits than its factorization.

201212102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43637496.

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

Adding to 201212102121 its reverse (121201212102), we get a palindrome (322413314223).

It can be divided in two parts, 201212102 and 121, that multiplied together give a palindrome (24346664342).

The spelling of 201212102121 in words is "two hundred one billion, two hundred twelve million, one hundred two thousand, one hundred twenty-one".