31300123021 has 2 divisors, whose sum is σ = 31300123022. Its totient is φ = 31300123020.

The previous prime is 31300123003. The next prime is 31300123051. The reversal of 31300123021 is 12032100313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29202024996 + 2098098025 = 170886^2 + 45805^2 .

It is an emirp because it is prime and its reverse (12032100313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31300123021 is a prime.

It is a super-2 number, since 2×31300123021² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31300122986 and 31300123004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31300123051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650061510 + 15650061511.

It is an arithmetic number, because the mean of its divisors is an integer number (15650061511).

Almost surely, 2^31300123021 is an apocalyptic number.

It is an amenable number.

31300123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31300123021 is an equidigital number, since it uses as much as digits as its factorization.

31300123021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31300123021 its reverse (12032100313), we get a palindrome (43332223334).

The spelling of 31300123021 in words is "thirty-one billion, three hundred million, one hundred twenty-three thousand, twenty-one".