201111012100021 has 8 divisors (see below), whose sum is σ = 212018422440384. Its totient is φ = 190383889534080.

The previous prime is 201111012100007. The next prime is 201111012100043. The reversal of 201111012100021 is 120001210111102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201111012100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111012099974 and 201111012100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111012100081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45071941315 + ... + 45071945776.

It is an arithmetic number, because the mean of its divisors is an integer number (26502302805048).

Almost surely, 2^{201111012100021} is an apocalyptic number.

It is an amenable number.

201111012100021 is a deficient number, since it is larger than the sum of its proper divisors (10907410340363).

201111012100021 is an equidigital number, since it uses as much as digits as its factorization.

201111012100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90143887211.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201111012100021 its reverse (120001210111102), we get a palindrome (321112222211123).

The spelling of 201111012100021 in words is "two hundred one trillion, one hundred eleven billion, twelve million, one hundred thousand, twenty-one".