21453631473037 has 2 divisors, whose sum is σ = 21453631473038. Its totient is φ = 21453631473036.

The previous prime is 21453631472989. The next prime is 21453631473083. The reversal of 21453631473037 is 73037413635412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13783911103561 + 7669720369476 = 3712669^2 + 2769426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21453631473037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21453631573037) 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, 10726815736518 + 10726815736519.

It is an arithmetic number, because the mean of its divisors is an integer number (10726815736519).

Almost surely, 2^{21453631473037} is an apocalyptic number.

It is an amenable number.

21453631473037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21453631473037 is an equidigital number, since it uses as much as digits as its factorization.

21453631473037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 49.

The spelling of 21453631473037 in words is "twenty-one trillion, four hundred fifty-three billion, six hundred thirty-one million, four hundred seventy-three thousand, thirty-seven".