21864826067 has 16 divisors (see below), whose sum is σ = 25291284480. Its totient is φ = 18514465728.

The previous prime is 21864826033. The next prime is 21864826069. The reversal of 21864826067 is 76062846812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21864826067 - 2⁸ = 21864825811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21864826069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724718 + ... + 754284.

It is an arithmetic number, because the mean of its divisors is an integer number (1580705280).

Almost surely, 2^21864826067 is an apocalyptic number.

21864826067 is a deficient number, since it is larger than the sum of its proper divisors (3426458413).

21864826067 is a wasteful number, since it uses less digits than its factorization.

21864826067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30850.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 21864826067 in words is "twenty-one billion, eight hundred sixty-four million, eight hundred twenty-six thousand, sixty-seven".