231302434221 has 16 divisors (see below), whose sum is σ = 342696832320. Its totient is φ = 154189671120.

The previous prime is 231302434157. The next prime is 231302434241. The reversal of 231302434221 is 122434203132.

231302434221 is a `hidden beast` number, since 2 + 3 + 1 + 3 + 0 + 2 + 434 + 221 = 666.

It is not a de Polignac number, because 231302434221 - 2⁶ = 231302434157 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 (231302434241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29991 + ... + 680811.

It is an arithmetic number, because the mean of its divisors is an integer number (21418552020).

Almost surely, 2^231302434221 is an apocalyptic number.

It is an amenable number.

231302434221 is a deficient number, since it is larger than the sum of its proper divisors (111394398099).

231302434221 is a wasteful number, since it uses less digits than its factorization.

231302434221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663993 (or 663987 counting only the distinct ones).

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

Adding to 231302434221 its reverse (122434203132), we get a palindrome (353736637353).

The spelling of 231302434221 in words is "two hundred thirty-one billion, three hundred two million, four hundred thirty-four thousand, two hundred twenty-one".