21826964827 has 4 divisors (see below), whose sum is σ = 21874726696. Its totient is φ = 21779202960.

The previous prime is 21826964791. The next prime is 21826964857. The reversal of 21826964827 is 72846962812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21826964827 - 2⁷ = 21826964699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21826964857) 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 3 ways as a sum of consecutive naturals, for example, 23880249 + ... + 23881162.

It is an arithmetic number, because the mean of its divisors is an integer number (5468681674).

Almost surely, 2^21826964827 is an apocalyptic number.

21826964827 is a deficient number, since it is larger than the sum of its proper divisors (47761869).

21826964827 is an equidigital number, since it uses as much as digits as its factorization.

21826964827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47761868.

The product of its digits is 4644864, while the sum is 55.

The spelling of 21826964827 in words is "twenty-one billion, eight hundred twenty-six million, nine hundred sixty-four thousand, eight hundred twenty-seven".