21425355171607 has 2 divisors, whose sum is σ = 21425355171608. Its totient is φ = 21425355171606.

The previous prime is 21425355171593. The next prime is 21425355171611. The reversal of 21425355171607 is 70617155352412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21425355171607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21425355171697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712677585803 + 10712677585804.

It is an arithmetic number, because the mean of its divisors is an integer number (10712677585804).

Almost surely, 2^{21425355171607} is an apocalyptic number.

21425355171607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425355171607 is an equidigital number, since it uses as much as digits as its factorization.

21425355171607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764000, while the sum is 49.

The spelling of 21425355171607 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred fifty-five million, one hundred seventy-one thousand, six hundred seven".