213231230421 has 32 divisors (see below), whose sum is σ = 324911001600. Its totient is φ = 123195334080.

The previous prime is 213231230417. The next prime is 213231230423. The reversal of 213231230421 is 124032132312.

It is not a de Polignac number, because 213231230421 - 2² = 213231230417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213231230391 and 213231230400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213231230423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1334601 + ... + 1485806.

It is an arithmetic number, because the mean of its divisors is an integer number (10153468800).

Almost surely, 2^213231230421 is an apocalyptic number.

It is an amenable number.

213231230421 is a deficient number, since it is larger than the sum of its proper divisors (111679771179).

213231230421 is a wasteful number, since it uses less digits than its factorization.

213231230421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820529.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 213231230421 its reverse (124032132312), we get a palindrome (337263362733).

The spelling of 213231230421 in words is "two hundred thirteen billion, two hundred thirty-one million, two hundred thirty thousand, four hundred twenty-one".