213243020406 has 48 divisors (see below), whose sum is σ = 497693532336. Its totient is φ = 65596557888.

The previous prime is 213243020401. The next prime is 213243020447. The reversal of 213243020406 is 604020342312.

213243020406 is a `hidden beast` number, since 2 + 13 + 243 + 0 + 2 + 0 + 406 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 213243020406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213243020401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 822876 + ... + 1050528.

It is an arithmetic number, because the mean of its divisors is an integer number (10368615257).

Almost surely, 2^213243020406 is an apocalyptic number.

213243020406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

213243020406 is an abundant number, since it is smaller than the sum of its proper divisors (284450511930).

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

213243020406 is a wasteful number, since it uses less digits than its factorization.

213243020406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231677 (or 231674 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 213243020406 its reverse (604020342312), we get a palindrome (817263362718).

The spelling of 213243020406 in words is "two hundred thirteen billion, two hundred forty-three million, twenty thousand, four hundred six".