21467263774417 has 2 divisors, whose sum is σ = 21467263774418. Its totient is φ = 21467263774416.

The previous prime is 21467263774387. The next prime is 21467263774421. The reversal of 21467263774417 is 71447736276412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17316717304896 + 4150546469521 = 4161336^2 + 2037289^2 .

It is a cyclic number.

It is not a de Polignac number, because 21467263774417 - 2²⁷ = 21467129556689 is a prime.

It is not a weakly prime, because it can be changed into another prime (21467263774487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10733631887208 + 10733631887209.

It is an arithmetic number, because the mean of its divisors is an integer number (10733631887209).

Almost surely, 2^{21467263774417} is an apocalyptic number.

It is an amenable number.

21467263774417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21467263774417 is an equidigital number, since it uses as much as digits as its factorization.

21467263774417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66382848, while the sum is 61.

The spelling of 21467263774417 in words is "twenty-one trillion, four hundred sixty-seven billion, two hundred sixty-three million, seven hundred seventy-four thousand, four hundred seventeen".