31210042321 has 2 divisors, whose sum is σ = 31210042322. Its totient is φ = 31210042320.

The previous prime is 31210042301. The next prime is 31210042343. The reversal of 31210042321 is 12324001213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30516246721 + 693795600 = 174689^2 + 26340^2 .

It is a cyclic number.

It is not a de Polignac number, because 31210042321 - 2¹³ = 31210034129 is a prime.

It is a super-2 number, since 2×31210042321² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31210042301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605021160 + 15605021161.

It is an arithmetic number, because the mean of its divisors is an integer number (15605021161).

Almost surely, 2^31210042321 is an apocalyptic number.

It is an amenable number.

31210042321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31210042321 is an equidigital number, since it uses as much as digits as its factorization.

31210042321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31210042321 its reverse (12324001213), we get a palindrome (43534043534).

The spelling of 31210042321 in words is "thirty-one billion, two hundred ten million, forty-two thousand, three hundred twenty-one".