21356322070697 has 2 divisors, whose sum is σ = 21356322070698. Its totient is φ = 21356322070696.

The previous prime is 21356322070661. The next prime is 21356322070717. The reversal of 21356322070697 is 79607022365312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12957199351321 + 8399122719376 = 3599611^2 + 2898124^2 .

It is a cyclic number.

It is not a de Polignac number, because 21356322070697 - 2¹⁰ = 21356322069673 is a prime.

It is not a weakly prime, because it can be changed into another prime (21356322070597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678161035348 + 10678161035349.

It is an arithmetic number, because the mean of its divisors is an integer number (10678161035349).

Almost surely, 2^{21356322070697} is an apocalyptic number.

It is an amenable number.

21356322070697 is a deficient number, since it is larger than the sum of its proper divisors (1).

21356322070697 is an equidigital number, since it uses as much as digits as its factorization.

21356322070697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 53.

The spelling of 21356322070697 in words is "twenty-one trillion, three hundred fifty-six billion, three hundred twenty-two million, seventy thousand, six hundred ninety-seven".