21021106762173 has 8 divisors (see below), whose sum is σ = 32032162685248. Its totient is φ = 12012061006944.

The previous prime is 21021106762157. The next prime is 21021106762193. The reversal of 21021106762173 is 37126760112012.

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

It is not a de Polignac number, because 21021106762173 - 2⁴ = 21021106762157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021106762153) 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, 500502541936 + ... + 500502541977.

It is an arithmetic number, because the mean of its divisors is an integer number (4004020335656).

Almost surely, 2^{21021106762173} is an apocalyptic number.

It is an amenable number.

21021106762173 is a deficient number, since it is larger than the sum of its proper divisors (11011055923075).

21021106762173 is a wasteful number, since it uses less digits than its factorization.

21021106762173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001005083923.

The product of its (nonzero) digits is 42336, while the sum is 39.

Adding to 21021106762173 its reverse (37126760112012), we get a palindrome (58147866874185).

The spelling of 21021106762173 in words is "twenty-one trillion, twenty-one billion, one hundred six million, seven hundred sixty-two thousand, one hundred seventy-three".