201211110021 has 16 divisors (see below), whose sum is σ = 272673086400. Its totient is φ = 131960239488.

The previous prime is 201211110017. The next prime is 201211110029. The reversal of 201211110021 is 120011112102.

It is not a de Polignac number, because 201211110021 - 2² = 201211110017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201211109979 and 201211110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211110029) 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, 1860091 + ... + 1965288.

It is an arithmetic number, because the mean of its divisors is an integer number (17042067900).

Almost surely, 2^201211110021 is an apocalyptic number.

It is an amenable number.

201211110021 is a deficient number, since it is larger than the sum of its proper divisors (71461976379).

201211110021 is a wasteful number, since it uses less digits than its factorization.

201211110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825668.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 201211110021 its reverse (120011112102), we get a palindrome (321222222123).

The spelling of 201211110021 in words is "two hundred one billion, two hundred eleven million, one hundred ten thousand, twenty-one".