201111122001021 has 64 divisors (see below), whose sum is σ = 276019400294400. Its totient is φ = 130201434408960.

The previous prime is 201111122001007. The next prime is 201111122001061. The reversal of 201111122001021 is 120100221111102.

It is a happy number.

It is not a de Polignac number, because 201111122001021 - 2¹³ = 201111121992829 is a prime.

It is a super-2 number, since 2×201111122001021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111122001061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15591211630 + ... + 15591224528.

It is an arithmetic number, because the mean of its divisors is an integer number (4312803129600).

Almost surely, 2^{201111122001021} is an apocalyptic number.

It is an amenable number.

201111122001021 is a deficient number, since it is larger than the sum of its proper divisors (74908278293379).

201111122001021 is a wasteful number, since it uses less digits than its factorization.

201111122001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15114.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201111122001021 its reverse (120100221111102), we get a palindrome (321211343112123).

The spelling of 201111122001021 in words is "two hundred one trillion, one hundred eleven billion, one hundred twenty-two million, one thousand, twenty-one".