210101020 has 24 divisors (see below), whose sum is σ = 441748944. Its totient is φ = 83938176.

The previous prime is 210101009. The next prime is 210101033. The reversal of 210101020 is 20101012.

210101020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 210100994 and 210101012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11712 + ... + 23608.

It is an arithmetic number, because the mean of its divisors is an integer number (18406206).

Almost surely, 2^210101020 is an apocalyptic number.

210101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210101020 is an abundant number, since it is smaller than the sum of its proper divisors (231647924).

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

210101020 is a wasteful number, since it uses less digits than its factorization.

210101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12789 (or 12787 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 210101020 is about 14494.8618482551. The cubic root of 210101020 is about 594.4874903142.

Adding to 210101020 its reverse (20101012), we get a palindrome (230202032).

The spelling of 210101020 in words is "two hundred ten million, one hundred one thousand, twenty".