100732721 has 2 divisors, whose sum is σ = 100732722. Its totient is φ = 100732720.

The previous prime is 100732679. The next prime is 100732739. The reversal of 100732721 is 127237001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87628321 + 13104400 = 9361^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 100732721 - 2²⁶ = 33623857 is a prime.

It is not a weakly prime, because it can be changed into another prime (100732321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50366360 + 50366361.

It is an arithmetic number, because the mean of its divisors is an integer number (50366361).

Almost surely, 2^100732721 is an apocalyptic number.

It is an amenable number.

100732721 is a deficient number, since it is larger than the sum of its proper divisors (1).

100732721 is an equidigital number, since it uses as much as digits as its factorization.

100732721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 100732721 is about 10036.5691847364. The cubic root of 100732721 is about 465.2897889188.

Adding to 100732721 its reverse (127237001), we get a palindrome (227969722).

The spelling of 100732721 in words is "one hundred million, seven hundred thirty-two thousand, seven hundred twenty-one".