21101875617 has 16 divisors (see below), whose sum is σ = 29850145920. Its totient is φ = 13214053632.

The previous prime is 21101875609. The next prime is 21101875643. The reversal of 21101875617 is 71657810112.

It is not a de Polignac number, because 21101875617 - 2³ = 21101875609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101875667) 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, 385642 + ... + 436947.

It is an arithmetic number, because the mean of its divisors is an integer number (1865634120).

Almost surely, 2^21101875617 is an apocalyptic number.

It is an amenable number.

21101875617 is a deficient number, since it is larger than the sum of its proper divisors (8748270303).

21101875617 is a wasteful number, since it uses less digits than its factorization.

21101875617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823112.

The product of its (nonzero) digits is 23520, while the sum is 39.

The spelling of 21101875617 in words is "twenty-one billion, one hundred one million, eight hundred seventy-five thousand, six hundred seventeen".