21281262959237 has 2 divisors, whose sum is σ = 21281262959238. Its totient is φ = 21281262959236.

The previous prime is 21281262959191. The next prime is 21281262959263. The reversal of 21281262959237 is 73295926218212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21273781747201 + 7481212036 = 4612351^2 + 86494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21281262959237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21281262959137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10640631479618 + 10640631479619.

It is an arithmetic number, because the mean of its divisors is an integer number (10640631479619).

Almost surely, 2^{21281262959237} is an apocalyptic number.

It is an amenable number.

21281262959237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21281262959237 is an equidigital number, since it uses as much as digits as its factorization.

21281262959237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 59.

The spelling of 21281262959237 in words is "twenty-one trillion, two hundred eighty-one billion, two hundred sixty-two million, nine hundred fifty-nine thousand, two hundred thirty-seven".