21708326634037 has 2 divisors, whose sum is σ = 21708326634038. Its totient is φ = 21708326634036.

The previous prime is 21708326634019. The next prime is 21708326634091. The reversal of 21708326634037 is 73043662380712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18556675600516 + 3151651033521 = 4307746^2 + 1775289^2 .

It is a cyclic number.

It is not a de Polignac number, because 21708326634037 - 2³¹ = 21706179150389 is a prime.

It is a super-2 number, since 2×21708326634037² (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 (21708326637037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10854163317018 + 10854163317019.

It is an arithmetic number, because the mean of its divisors is an integer number (10854163317019).

Almost surely, 2^{21708326634037} is an apocalyptic number.

It is an amenable number.

21708326634037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21708326634037 is an equidigital number, since it uses as much as digits as its factorization.

21708326634037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 52.

The spelling of 21708326634037 in words is "twenty-one trillion, seven hundred eight billion, three hundred twenty-six million, six hundred thirty-four thousand, thirty-seven".