21075173691109 has 16 divisors (see below), whose sum is σ = 22323718309248. Its totient is φ = 19827611356672.

The previous prime is 21075173691097. The next prime is 21075173691161. The reversal of 21075173691109 is 90119637157012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21075173691109 - 2¹³ = 21075173682917 is a prime.

It is a super-2 number, since 2×21075173691109² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075173091109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947315424 + ... + 947337670.

It is an arithmetic number, because the mean of its divisors is an integer number (1395232394328).

Almost surely, 2^{21075173691109} is an apocalyptic number.

It is an amenable number.

21075173691109 is a deficient number, since it is larger than the sum of its proper divisors (1248544618139).

21075173691109 is a wasteful number, since it uses less digits than its factorization.

21075173691109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41804.

The product of its (nonzero) digits is 714420, while the sum is 52.

The spelling of 21075173691109 in words is "twenty-one trillion, seventy-five billion, one hundred seventy-three million, six hundred ninety-one thousand, one hundred nine".