2121010110 has 40 divisors (see below), whose sum is σ = 5703162696. Its totient is φ = 565602480.

The previous prime is 2121010081. The next prime is 2121010123. The reversal of 2121010110 is 110101212.

It is a happy number.

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 = 2121010092 and 2121010101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1308456 + ... + 1310075.

Almost surely, 2^2121010110 is an apocalyptic number.

2121010110 is an abundant number, since it is smaller than the sum of its proper divisors (3582152586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121010110 is a wasteful number, since it uses less digits than its factorization.

2121010110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618550 (or 2618541 counting only the distinct ones).

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

The square root of 2121010110 is about 46054.4255202472. The cubic root of 2121010110 is about 1284.8356535061.

Adding to 2121010110 its reverse (110101212), we get a palindrome (2231111322).

The spelling of 2121010110 in words is "two billion, one hundred twenty-one million, ten thousand, one hundred ten".