21489364067 has 4 divisors (see below), whose sum is σ = 21534227520. Its totient is φ = 21444500616.

The previous prime is 21489364049. The next prime is 21489364069. The reversal of 21489364067 is 76046398412.

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 21489364067 - 2⁸ = 21489363811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21489364069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22431008 + ... + 22431965.

It is an arithmetic number, because the mean of its divisors is an integer number (5383556880).

Almost surely, 2^21489364067 is an apocalyptic number.

21489364067 is a deficient number, since it is larger than the sum of its proper divisors (44863453).

21489364067 is an equidigital number, since it uses as much as digits as its factorization.

21489364067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44863452.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 21489364067 in words is "twenty-one billion, four hundred eighty-nine million, three hundred sixty-four thousand, sixty-seven".