2101210120 has 32 divisors (see below), whose sum is σ = 4776471000. Its totient is φ = 831817728.

The previous prime is 2101210099. The next prime is 2101210121. The reversal of 2101210120 is 210121012.

It can be written as a sum of positive squares in 4 ways, for example, as 1998268804 + 102941316 = 44702^2 + 10146^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2101210097 and 2101210106.

It is not an unprimeable number, because it can be changed into a prime (2101210121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266895 + ... + 274654.

Almost surely, 2^2101210120 is an apocalyptic number.

2101210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101210120 is an abundant number, since it is smaller than the sum of its proper divisors (2675260880).

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

2101210120 is a wasteful number, since it uses less digits than its factorization.

2101210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541657 (or 541653 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2101210120 is about 45838.9585396527. The cubic root of 2101210120 is about 1280.8250946530.

2101210120 divided by its sum of digits (10) gives a palindrome (210121012).

Adding to 2101210120 its reverse (210121012), we get a palindrome (2311331132).

The spelling of 2101210120 in words is "two billion, one hundred one million, two hundred ten thousand, one hundred twenty".