231301222421 has 4 divisors (see below), whose sum is σ = 231495105612. Its totient is φ = 231107339232.

The previous prime is 231301222387. The next prime is 231301222423. The reversal of 231301222421 is 124222103132.

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 149702443396 + 81598779025 = 386914^2 + 285655^2 .

It is a cyclic number.

It is not a de Polignac number, because 231301222421 - 2⁶ = 231301222357 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 (231301222423) 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, 96939806 + ... + 96942191.

It is an arithmetic number, because the mean of its divisors is an integer number (57873776403).

Almost surely, 2^231301222421 is an apocalyptic number.

It is an amenable number.

231301222421 is a deficient number, since it is larger than the sum of its proper divisors (193883191).

231301222421 is a wasteful number, since it uses less digits than its factorization.

231301222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193883190.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 231301222421 its reverse (124222103132), we get a palindrome (355523325553).

The spelling of 231301222421 in words is "two hundred thirty-one billion, three hundred one million, two hundred twenty-two thousand, four hundred twenty-one".