100721296 has 45 divisors (see below), whose sum is σ = 212414139. Its totient is φ = 46245888.

The previous prime is 100721281. The next prime is 100721317. The reversal of 100721296 is 692127001.

It is a happy number.

The square root of 100721296 is 10036.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 37994896 + 62726400 = 6164^2 + 7920^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 521776 + ... + 521968.

Almost surely, 2^100721296 is an apocalyptic number.

100721296 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

100721296 is the 10036-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100721296

100721296 is an abundant number, since it is smaller than the sum of its proper divisors (111692843).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100721296 is an equidigital number, since it uses as much as digits as its factorization.

100721296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The cubic root of 100721296 is about 465.2721973597.

Adding to 100721296 its reverse (692127001), we get a palindrome (792848297).

The spelling of 100721296 in words is "one hundred million, seven hundred twenty-one thousand, two hundred ninety-six".