21477430751237 has 2 divisors, whose sum is σ = 21477430751238. Its totient is φ = 21477430751236.

The previous prime is 21477430751209. The next prime is 21477430751291. The reversal of 21477430751237 is 73215703477412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10857855355876 + 10619575395361 = 3295126^2 + 3258769^2 .

It is a cyclic number.

It is not a de Polignac number, because 21477430751237 - 2¹⁸ = 21477430489093 is a prime.

It is a super-2 number, since 2×21477430751237² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21477430781237) 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, 10738715375618 + 10738715375619.

It is an arithmetic number, because the mean of its divisors is an integer number (10738715375619).

Almost surely, 2^{21477430751237} is an apocalyptic number.

It is an amenable number.

21477430751237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21477430751237 is an equidigital number, since it uses as much as digits as its factorization.

21477430751237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6914880, while the sum is 53.

The spelling of 21477430751237 in words is "twenty-one trillion, four hundred seventy-seven billion, four hundred thirty million, seven hundred fifty-one thousand, two hundred thirty-seven".