2101212020 has 12 divisors (see below), whose sum is σ = 4412545284. Its totient is φ = 840484800.

The previous prime is 2101212011. The next prime is 2101212041. The reversal of 2101212020 is 202121012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 591267856 + 1509944164 = 24316^2 + 38858^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2101211992 and 2101212010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52530281 + ... + 52530320.

It is an arithmetic number, because the mean of its divisors is an integer number (367712107).

Almost surely, 2^2101212020 is an apocalyptic number.

2101212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101212020 is an abundant number, since it is smaller than the sum of its proper divisors (2311333264).

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

2101212020 is a wasteful number, since it uses less digits than its factorization.

2101212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105060610 (or 105060608 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2101212020 is about 45838.9792643772. The cubic root of 2101212020 is about 1280.8254807110.

Adding to 2101212020 its reverse (202121012), we get a palindrome (2303333032).

The spelling of 2101212020 in words is "two billion, one hundred one million, two hundred twelve thousand, twenty".