21700667567 has 2 divisors, whose sum is σ = 21700667568. Its totient is φ = 21700667566.

The previous prime is 21700667561. The next prime is 21700667591. The reversal of 21700667567 is 76576600712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21700667567 - 2⁴ = 21700667551 is a prime.

It is a super-4 number, since 4×21700667567⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21700667561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10850333783 + 10850333784.

It is an arithmetic number, because the mean of its divisors is an integer number (10850333784).

Almost surely, 2^21700667567 is an apocalyptic number.

21700667567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21700667567 is an equidigital number, since it uses as much as digits as its factorization.

21700667567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 740880, while the sum is 47.

The spelling of 21700667567 in words is "twenty-one billion, seven hundred million, six hundred sixty-seven thousand, five hundred sixty-seven".