21050067989 has 8 divisors (see below), whose sum is σ = 21607077888. Its totient is φ = 20497605520.

The previous prime is 21050067917. The next prime is 21050068021. The reversal of 21050067989 is 98976005012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21050067989 - 2¹⁶ = 21050002453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050063989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1127477 + ... + 1145994.

It is an arithmetic number, because the mean of its divisors is an integer number (2700884736).

Almost surely, 2^21050067989 is an apocalyptic number.

It is an amenable number.

21050067989 is a deficient number, since it is larger than the sum of its proper divisors (557009899).

21050067989 is a wasteful number, since it uses less digits than its factorization.

21050067989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273715.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 21050067989 in words is "twenty-one billion, fifty million, sixty-seven thousand, nine hundred eighty-nine".