2101212120 has 96 divisors (see below), whose sum is σ = 7332822000. Its totient is φ = 480275712.

The previous prime is 2101212119. The next prime is 2101212131. The reversal of 2101212120 is 212121012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2101212096 and 2101212105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172795 + ... + 184554.

Almost surely, 2^2101212120 is an apocalyptic number.

2101212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101212120 is an abundant number, since it is smaller than the sum of its proper divisors (5231609880).

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

2101212120 is a wasteful number, since it uses less digits than its factorization.

2101212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357377 (or 357366 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2101212120 is about 45838.9803551519. The cubic root of 2101212120 is about 1280.8255010299.

Adding to 2101212120 its reverse (212121012), we get a palindrome (2313333132).

The spelling of 2101212120 in words is "two billion, one hundred one million, two hundred twelve thousand, one hundred twenty".