201111211121021 has 16 divisors (see below), whose sum is σ = 213051612054528. Its totient is φ = 189183078201600.

The previous prime is 201111211120993. The next prime is 201111211121101. The reversal of 201111211121021 is 120121112111102.

It is not a de Polignac number, because 201111211121021 - 2⁴² = 196713164609917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111211151021) 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, 764227256 + ... + 764490366.

It is an arithmetic number, because the mean of its divisors is an integer number (13315725753408).

Almost surely, 2^{201111211121021} is an apocalyptic number.

It is an amenable number.

201111211121021 is a deficient number, since it is larger than the sum of its proper divisors (11940400933507).

201111211121021 is a wasteful number, since it uses less digits than its factorization.

201111211121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286252.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 201111211121021 its reverse (120121112111102), we get a palindrome (321232323232123).

The spelling of 201111211121021 in words is "two hundred one trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-one thousand, twenty-one".