213231421245 has 16 divisors (see below), whose sum is σ = 350391093120. Its totient is φ = 110649818304.

The previous prime is 213231421237. The next prime is 213231421253. The reversal of 213231421245 is 542124132312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (213231421237) and next prime (213231421253).

It is not a de Polignac number, because 213231421245 - 2³ = 213231421237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192099825 + ... + 192100934.

It is an arithmetic number, because the mean of its divisors is an integer number (21899443320).

Almost surely, 2^213231421245 is an apocalyptic number.

It is an amenable number.

213231421245 is a deficient number, since it is larger than the sum of its proper divisors (137159671875).

213231421245 is a wasteful number, since it uses less digits than its factorization.

213231421245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384200804.

The product of its digits is 11520, while the sum is 30.

Adding to 213231421245 its reverse (542124132312), we get a palindrome (755355553557).

The spelling of 213231421245 in words is "two hundred thirteen billion, two hundred thirty-one million, four hundred twenty-one thousand, two hundred forty-five".