100012421 has 2 divisors, whose sum is σ = 100012422. Its totient is φ = 100012420.

The previous prime is 100012397. The next prime is 100012457. The reversal of 100012421 is 124210001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97792321 + 2220100 = 9889^2 + 1490^2 .

It is a cyclic number.

It is not a de Polignac number, because 100012421 - 2¹⁰ = 100011397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100012481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50006210 + 50006211.

It is an arithmetic number, because the mean of its divisors is an integer number (50006211).

Almost surely, 2^100012421 is an apocalyptic number.

It is an amenable number.

100012421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100012421 is an equidigital number, since it uses as much as digits as its factorization.

100012421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 100012421 is about 10000.6210307160. The cubic root of 100012421 is about 464.1781002906.

Adding to 100012421 its reverse (124210001), we get a palindrome (224222422).

The spelling of 100012421 in words is "one hundred million, twelve thousand, four hundred twenty-one".