21385958573 has 8 divisors (see below), whose sum is σ = 25727469120. Its totient is φ = 17366041440.

The previous prime is 21385958569. The next prime is 21385958579. The reversal of 21385958573 is 37585958312.

It is a happy number.

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 21385958573 - 2² = 21385958569 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385958579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80398208 + ... + 80398473.

It is an arithmetic number, because the mean of its divisors is an integer number (3215933640).

Almost surely, 2^21385958573 is an apocalyptic number.

It is an amenable number.

21385958573 is a deficient number, since it is larger than the sum of its proper divisors (4341510547).

21385958573 is a wasteful number, since it uses less digits than its factorization.

21385958573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160796707.

The product of its digits is 9072000, while the sum is 56.

The spelling of 21385958573 in words is "twenty-one billion, three hundred eighty-five million, nine hundred fifty-eight thousand, five hundred seventy-three".