31224134425321 has 2 divisors, whose sum is σ = 31224134425322. Its totient is φ = 31224134425320.

The previous prime is 31224134425313. The next prime is 31224134425331. The reversal of 31224134425321 is 12352443142213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30785142046096 + 438992379225 = 5548436^2 + 662565^2 .

It is a cyclic number.

It is not a de Polignac number, because 31224134425321 - 2³ = 31224134425313 is a prime.

It is a super-2 number, since 2×31224134425321² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31224134425301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612067212660 + 15612067212661.

It is an arithmetic number, because the mean of its divisors is an integer number (15612067212661).

Almost surely, 2^{31224134425321} is an apocalyptic number.

It is an amenable number.

31224134425321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31224134425321 is an equidigital number, since it uses as much as digits as its factorization.

31224134425321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 37.

Adding to 31224134425321 its reverse (12352443142213), we get a palindrome (43576577567534).

The spelling of 31224134425321 in words is "thirty-one trillion, two hundred twenty-four billion, one hundred thirty-four million, four hundred twenty-five thousand, three hundred twenty-one".