21445457288287 has 2 divisors, whose sum is σ = 21445457288288. Its totient is φ = 21445457288286.

The previous prime is 21445457288209. The next prime is 21445457288317. The reversal of 21445457288287 is 78288275454412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21445457288287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21445457283287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722728644143 + 10722728644144.

It is an arithmetic number, because the mean of its divisors is an integer number (10722728644144).

Almost surely, 2^{21445457288287} is an apocalyptic number.

21445457288287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21445457288287 is an equidigital number, since it uses as much as digits as its factorization.

21445457288287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 321126400, while the sum is 67.

The spelling of 21445457288287 in words is "twenty-one trillion, four hundred forty-five billion, four hundred fifty-seven million, two hundred eighty-eight thousand, two hundred eighty-seven".