21071712101 has 12 divisors (see below), whose sum is σ = 24380496000. Its totient is φ = 18147884040.

The previous prime is 21071712097. The next prime is 21071712133. The reversal of 21071712101 is 10121717012.

It is not a de Polignac number, because 21071712101 - 2² = 21071712097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071712191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4580501 + ... + 4585098.

It is an arithmetic number, because the mean of its divisors is an integer number (2031708000).

Almost surely, 2^21071712101 is an apocalyptic number.

It is an amenable number.

21071712101 is a deficient number, since it is larger than the sum of its proper divisors (3308783899).

21071712101 is a wasteful number, since it uses less digits than its factorization.

21071712101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9165640 (or 9165629 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 23.

The spelling of 21071712101 in words is "twenty-one billion, seventy-one million, seven hundred twelve thousand, one hundred one".