201021212121011 has 16 divisors (see below), whose sum is σ = 204943291430400. Its totient is φ = 197103928975200.

The previous prime is 201021212120977. The next prime is 201021212121019. The reversal of 201021212121011 is 110121212120102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021212121011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201021212121019) 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, 4173744416 + ... + 4173792578.

It is an arithmetic number, because the mean of its divisors is an integer number (12808955714400).

Almost surely, 2^{201021212121011} is an apocalyptic number.

201021212121011 is a deficient number, since it is larger than the sum of its proper divisors (3922079309389).

201021212121011 is a wasteful number, since it uses less digits than its factorization.

201021212121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96266.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201021212121011 its reverse (110121212120102), we get a palindrome (311142424241113).

Subtracting from 201021212121011 its reverse (110121212120102), we obtain a palindrome (90900000000909).

The spelling of 201021212121011 in words is "two hundred one trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, eleven".