21455692558247 has 2 divisors, whose sum is σ = 21455692558248. Its totient is φ = 21455692558246.

The previous prime is 21455692558171. The next prime is 21455692558277. The reversal of 21455692558247 is 74285529655412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21455692558247 - 2¹² = 21455692554151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21455692558277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727846279123 + 10727846279124.

It is an arithmetic number, because the mean of its divisors is an integer number (10727846279124).

Almost surely, 2^{21455692558247} is an apocalyptic number.

21455692558247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455692558247 is an equidigital number, since it uses as much as digits as its factorization.

21455692558247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920000, while the sum is 65.

The spelling of 21455692558247 in words is "twenty-one trillion, four hundred fifty-five billion, six hundred ninety-two million, five hundred fifty-eight thousand, two hundred forty-seven".