21057369946567 has 2 divisors, whose sum is σ = 21057369946568. Its totient is φ = 21057369946566.

The previous prime is 21057369946447. The next prime is 21057369946583. The reversal of 21057369946567 is 76564996375012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21057369946567 - 2⁷ = 21057369946439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21057369946496 and 21057369946505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21057369946667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10528684973283 + 10528684973284.

It is an arithmetic number, because the mean of its divisors is an integer number (10528684973284).

Almost surely, 2^{21057369946567} is an apocalyptic number.

21057369946567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21057369946567 is an equidigital number, since it uses as much as digits as its factorization.

21057369946567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 514382400, while the sum is 70.

The spelling of 21057369946567 in words is "twenty-one trillion, fifty-seven billion, three hundred sixty-nine million, nine hundred forty-six thousand, five hundred sixty-seven".