213421234525 has 24 divisors (see below), whose sum is σ = 267907790304. Its totient is φ = 168631425600.

The previous prime is 213421234517. The next prime is 213421234529. The reversal of 213421234525 is 525432124312.

It is not a de Polignac number, because 213421234525 - 2³ = 213421234517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213421234529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8343255 + ... + 8368795.

It is an arithmetic number, because the mean of its divisors is an integer number (11162824596).

Almost surely, 2^213421234525 is an apocalyptic number.

213421234525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213421234525 is a deficient number, since it is larger than the sum of its proper divisors (54486555779).

213421234525 is a wasteful number, since it uses less digits than its factorization.

213421234525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29661 (or 29656 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

Adding to 213421234525 its reverse (525432124312), we get a palindrome (738853358837).

The spelling of 213421234525 in words is "two hundred thirteen billion, four hundred twenty-one million, two hundred thirty-four thousand, five hundred twenty-five".