21086762273953 has 2 divisors, whose sum is σ = 21086762273954. Its totient is φ = 21086762273952.

The previous prime is 21086762273947. The next prime is 21086762273971. The reversal of 21086762273953 is 35937226768012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17380494296064 + 3706267977889 = 4168992^2 + 1925167^2 .

It is a cyclic number.

It is not a de Polignac number, because 21086762273953 - 2¹³ = 21086762265761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21086762273891 and 21086762273900.

It is not a weakly prime, because it can be changed into another prime (21086762273903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10543381136976 + 10543381136977.

It is an arithmetic number, because the mean of its divisors is an integer number (10543381136977).

Almost surely, 2^{21086762273953} is an apocalyptic number.

It is an amenable number.

21086762273953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21086762273953 is an equidigital number, since it uses as much as digits as its factorization.

21086762273953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 61.

The spelling of 21086762273953 in words is "twenty-one trillion, eighty-six billion, seven hundred sixty-two million, two hundred seventy-three thousand, nine hundred fifty-three".