106721652005 has 4 divisors (see below), whose sum is σ = 128065982412. Its totient is φ = 85377321600.

The previous prime is 106721651977. The next prime is 106721652041. The reversal of 106721652005 is 500256127601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71371259716 + 35350392289 = 267154^2 + 188017^2 .

It is not a de Polignac number, because 106721652005 - 2⁶ = 106721651941 is a prime.

It is a super-2 number, since 2×106721652005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10672165196 + ... + 10672165205.

It is an arithmetic number, because the mean of its divisors is an integer number (32016495603).

Almost surely, 2^106721652005 is an apocalyptic number.

It is an amenable number.

106721652005 is a deficient number, since it is larger than the sum of its proper divisors (21344330407).

106721652005 is an equidigital number, since it uses as much as digits as its factorization.

106721652005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21344330406.

The product of its (nonzero) digits is 25200, while the sum is 35.

Adding to 106721652005 its reverse (500256127601), we get a palindrome (606977779606).

The spelling of 106721652005 in words is "one hundred six billion, seven hundred twenty-one million, six hundred fifty-two thousand, five".