21320563067 has 2 divisors, whose sum is σ = 21320563068. Its totient is φ = 21320563066.

The previous prime is 21320563063. The next prime is 21320563079. The reversal of 21320563067 is 76036502312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21320563067 - 2² = 21320563063 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320563063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660281533 + 10660281534.

It is an arithmetic number, because the mean of its divisors is an integer number (10660281534).

Almost surely, 2^21320563067 is an apocalyptic number.

21320563067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320563067 is an equidigital number, since it uses as much as digits as its factorization.

21320563067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 21320563067 in words is "twenty-one billion, three hundred twenty million, five hundred sixty-three thousand, sixty-seven".