213021012 has 12 divisors (see below), whose sum is σ = 497049056. Its totient is φ = 71007000.

The previous prime is 213021001. The next prime is 213021013. The reversal of 213021012 is 210120312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 17751751 = 213021012 / (2 + 1 + 3 + 0 + 2 + 1 + 0 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213021013) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8875864 + ... + 8875887.

Almost surely, 2^213021012 is an apocalyptic number.

It is an amenable number.

213021012 is an abundant number, since it is smaller than the sum of its proper divisors (284028044).

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

213021012 is a wasteful number, since it uses less digits than its factorization.

213021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17751758 (or 17751756 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 213021012 is about 14595.2393608327. The cubic root of 213021012 is about 597.2288991476.

Adding to 213021012 its reverse (210120312), we get a palindrome (423141324).

The spelling of 213021012 in words is "two hundred thirteen million, twenty-one thousand, twelve".