201022111121 has 4 divisors (see below), whose sum is σ = 216485350452. Its totient is φ = 185558871792.

The previous prime is 201022111117. The next prime is 201022111159. The reversal of 201022111121 is 121111220102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57521306896 + 143500804225 = 239836^2 + 378815^2 .

It is a cyclic number.

It is not a de Polignac number, because 201022111121 - 2² = 201022111117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201022111096 and 201022111105.

It is not an unprimeable number, because it can be changed into a prime (201022111321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7731619646 + ... + 7731619671.

It is an arithmetic number, because the mean of its divisors is an integer number (54121337613).

Almost surely, 2^201022111121 is an apocalyptic number.

It is an amenable number.

201022111121 is a deficient number, since it is larger than the sum of its proper divisors (15463239331).

201022111121 is a wasteful number, since it uses less digits than its factorization.

201022111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15463239330.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201022111121 its reverse (121111220102), we get a palindrome (322133331223).

The spelling of 201022111121 in words is "two hundred one billion, twenty-two million, one hundred eleven thousand, one hundred twenty-one".