2110110021 has 20 divisors (see below), whose sum is σ = 3153744000. Its totient is φ = 1406024136.

The previous prime is 2110110019. The next prime is 2110110029. The reversal of 2110110021 is 1200110112.

It is a happy number.

It is not a de Polignac number, because 2110110021 - 2¹ = 2110110019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2110109985 and 2110110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110110029) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 188890 + ... + 199748.

It is an arithmetic number, because the mean of its divisors is an integer number (157687200).

Almost surely, 2^2110110021 is an apocalyptic number.

It is an amenable number.

2110110021 is a deficient number, since it is larger than the sum of its proper divisors (1043633979).

2110110021 is a wasteful number, since it uses less digits than its factorization.

2110110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13270 (or 13261 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2110110021 is about 45935.9338753443. The cubic root of 2110110021 is about 1282.6309048693.

Adding to 2110110021 its reverse (1200110112), we get a palindrome (3310220133).

Subtracting from 2110110021 its reverse (1200110112), we obtain a palindrome (909999909).

The spelling of 2110110021 in words is "two billion, one hundred ten million, one hundred ten thousand, twenty-one".