21586401753797 has 2 divisors, whose sum is σ = 21586401753798. Its totient is φ = 21586401753796.

The previous prime is 21586401753781. The next prime is 21586401753877. The reversal of 21586401753797 is 79735710468512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21495917504161 + 90484249636 = 4636369^2 + 300806^2 .

It is a cyclic number.

It is not a de Polignac number, because 21586401753797 - 2⁴ = 21586401753781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21586401753097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10793200876898 + 10793200876899.

It is an arithmetic number, because the mean of its divisors is an integer number (10793200876899).

It is a 1-persistent number, because it is pandigital, but 2⋅21586401753797 = 43172803507594 is not.

Almost surely, 2^{21586401753797} is an apocalyptic number.

It is an amenable number.

21586401753797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21586401753797 is an equidigital number, since it uses as much as digits as its factorization.

21586401753797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88905600, while the sum is 65.

The spelling of 21586401753797 in words is "twenty-one trillion, five hundred eighty-six billion, four hundred one million, seven hundred fifty-three thousand, seven hundred ninety-seven".