21275173673 has 8 divisors (see below), whose sum is σ = 23907887808. Its totient is φ = 18784768464.

The previous prime is 21275173631. The next prime is 21275173681. The reversal of 21275173673 is 37637157212.

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 21275173673 - 2⁶ = 21275173609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275173973) 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, 35576915 + ... + 35577512.

It is an arithmetic number, because the mean of its divisors is an integer number (2988485976).

Almost surely, 2^21275173673 is an apocalyptic number.

21275173673 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21275173673 is a deficient number, since it is larger than the sum of its proper divisors (2632714135).

21275173673 is a wasteful number, since it uses less digits than its factorization.

21275173673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71154463.

The product of its digits is 370440, while the sum is 44.

The spelling of 21275173673 in words is "twenty-one billion, two hundred seventy-five million, one hundred seventy-three thousand, six hundred seventy-three".