231325214521 has 2 divisors, whose sum is σ = 231325214522. Its totient is φ = 231325214520.

The previous prime is 231325214467. The next prime is 231325214543. The reversal of 231325214521 is 125412523132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217486986025 + 13838228496 = 466355^2 + 117636^2 .

It is a cyclic number.

It is not a de Polignac number, because 231325214521 - 2⁹ = 231325214009 is a prime.

It is a super-2 number, since 2×231325214521² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231325215521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115662607260 + 115662607261.

It is an arithmetic number, because the mean of its divisors is an integer number (115662607261).

Almost surely, 2^231325214521 is an apocalyptic number.

It is an amenable number.

231325214521 is a deficient number, since it is larger than the sum of its proper divisors (1).

231325214521 is an equidigital number, since it uses as much as digits as its factorization.

231325214521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 31.

Adding to 231325214521 its reverse (125412523132), we get a palindrome (356737737653).

The spelling of 231325214521 in words is "two hundred thirty-one billion, three hundred twenty-five million, two hundred fourteen thousand, five hundred twenty-one".