210111011102021 has 4 divisors (see below), whose sum is σ = 210129299129100. Its totient is φ = 210092723074944.

The previous prime is 210111011102009. The next prime is 210111011102071. The reversal of 210111011102021 is 120201110111012.

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 35014971849025 + 175096039252996 = 5917345^2 + 13232386^2 .

It is a cyclic number.

It is not a de Polignac number, because 210111011102021 - 2²² = 210111006907717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210111011101987 and 210111011102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111011102071) 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, 9143996306 + ... + 9144019283.

It is an arithmetic number, because the mean of its divisors is an integer number (52532324782275).

Almost surely, 2^{210111011102021} is an apocalyptic number.

It is an amenable number.

210111011102021 is a deficient number, since it is larger than the sum of its proper divisors (18288027079).

210111011102021 is a wasteful number, since it uses less digits than its factorization.

210111011102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18288027078.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 210111011102021 its reverse (120201110111012), we get a palindrome (330312121213033).

The spelling of 210111011102021 in words is "two hundred ten trillion, one hundred eleven billion, eleven million, one hundred two thousand, twenty-one".