100121321 has 2 divisors, whose sum is σ = 100121322. Its totient is φ = 100121320.

The previous prime is 100121299. The next prime is 100121341. The reversal of 100121321 is 123121001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70744921 + 29376400 = 8411^2 + 5420^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121321 - 2⁶ = 100121257 is a prime.

It is not a weakly prime, because it can be changed into another prime (100121341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060660 + 50060661.

It is an arithmetic number, because the mean of its divisors is an integer number (50060661).

Almost surely, 2^100121321 is an apocalyptic number.

It is an amenable number.

100121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121321 is an equidigital number, since it uses as much as digits as its factorization.

100121321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 100121321 is about 10006.0642112671. The cubic root of 100121321 is about 464.3465149025.

Adding to 100121321 its reverse (123121001), we get a palindrome (223242322).

It can be divided in two parts, 1001 and 21321, that added together give a palindrome (22322).

The spelling of 100121321 in words is "one hundred million, one hundred twenty-one thousand, three hundred twenty-one".