21031431000037 has 2 divisors, whose sum is σ = 21031431000038. Its totient is φ = 21031431000036.

The previous prime is 21031431000031. The next prime is 21031431000061. The reversal of 21031431000037 is 73000013413012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16370124092001 + 4661306908036 = 4046001^2 + 2159006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031431000037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21031430999975 and 21031431000020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031431000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515715500018 + 10515715500019.

It is an arithmetic number, because the mean of its divisors is an integer number (10515715500019).

Almost surely, 2^{21031431000037} is an apocalyptic number.

It is an amenable number.

21031431000037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031431000037 is an equidigital number, since it uses as much as digits as its factorization.

21031431000037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21031431000037 its reverse (73000013413012), we get a palindrome (94031444413049).

The spelling of 21031431000037 in words is "twenty-one trillion, thirty-one billion, four hundred thirty-one million, thirty-seven", and thus it is an aban number.