21131022143237 has 2 divisors, whose sum is σ = 21131022143238. Its totient is φ = 21131022143236.

The previous prime is 21131022143213. The next prime is 21131022143243. The reversal of 21131022143237 is 73234122013112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12966235949956 + 8164786193281 = 3600866^2 + 2857409^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131022143237 - 2¹⁰ = 21131022142213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131022143437) 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, 10565511071618 + 10565511071619.

It is an arithmetic number, because the mean of its divisors is an integer number (10565511071619).

Almost surely, 2^{21131022143237} is an apocalyptic number.

It is an amenable number.

21131022143237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131022143237 is an equidigital number, since it uses as much as digits as its factorization.

21131022143237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 21131022143237 its reverse (73234122013112), we get a palindrome (94365144156349).

The spelling of 21131022143237 in words is "twenty-one trillion, one hundred thirty-one billion, twenty-two million, one hundred forty-three thousand, two hundred thirty-seven".