212021020 has 12 divisors (see below), whose sum is σ = 445244184. Its totient is φ = 84808400.

The previous prime is 212020987. The next prime is 212021021. The reversal of 212021020 is 20120212.

212021020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 212020988 and 212021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5300506 + ... + 5300545.

It is an arithmetic number, because the mean of its divisors is an integer number (37103682).

Almost surely, 2^212021020 is an apocalyptic number.

212021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021020 is an abundant number, since it is smaller than the sum of its proper divisors (233223164).

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

212021020 is a wasteful number, since it uses less digits than its factorization.

212021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601060 (or 10601058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 212021020 is about 14560.9415904329. The cubic root of 212021020 is about 596.2929021397.

Adding to 212021020 its reverse (20120212), we get a palindrome (232141232).

It can be divided in two parts, 21202 and 1020, that added together give a palindrome (22222).

The spelling of 212021020 in words is "two hundred twelve million, twenty-one thousand, twenty".