100721501005 has 8 divisors (see below), whose sum is σ = 120957304824. Its totient is φ = 80516198400.

The previous prime is 100721500993. The next prime is 100721501017. The reversal of 100721501005 is 500105127001.

It is an interprime number because it is at equal distance from previous prime (100721500993) and next prime (100721501017).

It can be written as a sum of positive squares in 4 ways, for example, as 68068288201 + 32653212804 = 260899^2 + 180702^2 .

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

It is not a de Polignac number, because 100721501005 - 2⁷ = 100721500877 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 7618036 + ... + 7631245.

It is an arithmetic number, because the mean of its divisors is an integer number (15119663103).

Almost surely, 2^100721501005 is an apocalyptic number.

It is an amenable number.

100721501005 is a deficient number, since it is larger than the sum of its proper divisors (20235803819).

100721501005 is a wasteful number, since it uses less digits than its factorization.

100721501005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15250607.

The product of its (nonzero) digits is 350, while the sum is 22.

Adding to 100721501005 its reverse (500105127001), we get a palindrome (600826628006).

The spelling of 100721501005 in words is "one hundred billion, seven hundred twenty-one million, five hundred one thousand, five".