213243230421 has 32 divisors (see below), whose sum is σ = 340281728640. Its totient is φ = 131201683200.

The previous prime is 213243230393. The next prime is 213243230437. The reversal of 213243230421 is 124032342312.

213243230421 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 4 + 3 + 230 + 421 = 666.

213243230421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-213243230421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213243230471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1886461 + ... + 1996301.

It is an arithmetic number, because the mean of its divisors is an integer number (10633804020).

Almost surely, 2^213243230421 is an apocalyptic number.

It is an amenable number.

213243230421 is a deficient number, since it is larger than the sum of its proper divisors (127038498219).

213243230421 is a wasteful number, since it uses less digits than its factorization.

213243230421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115394 (or 115388 counting only the distinct ones).

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

Adding to 213243230421 its reverse (124032342312), we get a palindrome (337275572733).

The spelling of 213243230421 in words is "two hundred thirteen billion, two hundred forty-three million, two hundred thirty thousand, four hundred twenty-one".