210021012 has 36 divisors (see below), whose sum is σ = 550551456. Its totient is φ = 70006680.

The previous prime is 210020989. The next prime is 210021047. The reversal of 210021012 is 210120012.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210020985 and 210021003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107064 + ... + 109007.

It is an arithmetic number, because the mean of its divisors is an integer number (15293096).

Almost surely, 2^210021012 is an apocalyptic number.

It is an amenable number.

210021012 is an abundant number, since it is smaller than the sum of its proper divisors (340530444).

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

210021012 is a wasteful number, since it uses less digits than its factorization.

210021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216090 (or 216076 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 210021012 is about 14492.1017109321. The cubic root of 210021012 is about 594.4120190101.

Adding to 210021012 its reverse (210120012), we get a palindrome (420141024).

The spelling of 210021012 in words is "two hundred ten million, twenty-one thousand, twelve".