100721151 has 10 divisors (see below), whose sum is σ = 150460112. Its totient is φ = 67147380.

The previous prime is 100721149. The next prime is 100721177. The reversal of 100721151 is 151127001.

It is a happy number.

It is not a de Polignac number, because 100721151 - 2¹ = 100721149 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100721191) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 621655 + ... + 621816.

Almost surely, 2^100721151 is an apocalyptic number.

100721151 is a deficient number, since it is larger than the sum of its proper divisors (49738961).

100721151 is an equidigital number, since it uses as much as digits as its factorization.

100721151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243483 (or 1243474 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 100721151 is about 10035.9927760038. The cubic root of 100721151 is about 465.2719740885.

Adding to 100721151 its reverse (151127001), we get a palindrome (251848152).

The spelling of 100721151 in words is "one hundred million, seven hundred twenty-one thousand, one hundred fifty-one".