21045030067 has 4 divisors (see below), whose sum is σ = 21442106160. Its totient is φ = 20647953976.

The previous prime is 21045030049. The next prime is 21045030101. The reversal of 21045030067 is 76003054012.

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 21045030067 - 2¹¹ = 21045028019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21045030767) 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, 198537967 + ... + 198538072.

It is an arithmetic number, because the mean of its divisors is an integer number (5360526540).

Almost surely, 2^21045030067 is an apocalyptic number.

21045030067 is a deficient number, since it is larger than the sum of its proper divisors (397076093).

21045030067 is an equidigital number, since it uses as much as digits as its factorization.

21045030067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397076092.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 21045030067 its reverse (76003054012), we get a palindrome (97048084079).

The spelling of 21045030067 in words is "twenty-one billion, forty-five million, thirty thousand, sixty-seven".