231421231322221 has 4 divisors (see below), whose sum is σ = 231474346137532. Its totient is φ = 231368116506912.

The previous prime is 231421231322161. The next prime is 231421231322249. The reversal of 231421231322221 is 122223132124132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196255975521321 + 35165255800900 = 14009139^2 + 5930030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231421231322221 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 (231421231322291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26557401120 + ... + 26557409833.

It is an arithmetic number, because the mean of its divisors is an integer number (57868586534383).

Almost surely, 2^{231421231322221} is an apocalyptic number.

It is an amenable number.

231421231322221 is a deficient number, since it is larger than the sum of its proper divisors (53114815311).

231421231322221 is an equidigital number, since it uses as much as digits as its factorization.

231421231322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53114815310.

The product of its digits is 13824, while the sum is 31.

Adding to 231421231322221 its reverse (122223132124132), we get a palindrome (353644363446353).

The spelling of 231421231322221 in words is "two hundred thirty-one trillion, four hundred twenty-one billion, two hundred thirty-one million, three hundred twenty-two thousand, two hundred twenty-one".