210021020 has 24 divisors (see below), whose sum is σ = 481139568. Its totient is φ = 76371200.

The previous prime is 210020989. The next prime is 210021047. The reversal of 210021020 is 20120012.

It is a junction number, because it is equal to n+sod(n) for n = 210020989 and 210021007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477101 + ... + 477540.

It is an arithmetic number, because the mean of its divisors is an integer number (20047482).

Almost surely, 2^210021020 is an apocalyptic number.

210021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021020 is an abundant number, since it is smaller than the sum of its proper divisors (271118548).

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

210021020 is a wasteful number, since it uses less digits than its factorization.

210021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954661 (or 954659 counting only the distinct ones).

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

The square root of 210021020 is about 14492.1019869445. The cubic root of 210021020 is about 594.4120265574.

Adding to 210021020 its reverse (20120012), we get a palindrome (230141032).

It can be divided in two parts, 21002 and 1020, that added together give a palindrome (22022).

The spelling of 210021020 in words is "two hundred ten million, twenty-one thousand, twenty".