331252421 has 2 divisors, whose sum is σ = 331252422. Its totient is φ = 331252420.

The previous prime is 331252409. The next prime is 331252423. The reversal of 331252421 is 124252133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323496196 + 7756225 = 17986^2 + 2785^2 .

It is a cyclic number.

It is not a de Polignac number, because 331252421 - 2⁶ = 331252357 is a prime.

It is a super-3 number, since 3×331252421³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 331252423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331252423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165626210 + 165626211.

It is an arithmetic number, because the mean of its divisors is an integer number (165626211).

Almost surely, 2^331252421 is an apocalyptic number.

It is an amenable number.

331252421 is a deficient number, since it is larger than the sum of its proper divisors (1).

331252421 is an equidigital number, since it uses as much as digits as its factorization.

331252421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 331252421 is about 18200.3412330648. The cubic root of 331252421 is about 691.9154374767.

The spelling of 331252421 in words is "three hundred thirty-one million, two hundred fifty-two thousand, four hundred twenty-one".