100210421 has 2 divisors, whose sum is σ = 100210422. Its totient is φ = 100210420.

The previous prime is 100210403. The next prime is 100210463. The reversal of 100210421 is 124012001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79834225 + 20376196 = 8935^2 + 4514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100210421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100212421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50105210 + 50105211.

It is an arithmetic number, because the mean of its divisors is an integer number (50105211).

Almost surely, 2^100210421 is an apocalyptic number.

It is an amenable number.

100210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100210421 is an equidigital number, since it uses as much as digits as its factorization.

100210421 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 100210421 is about 10010.5155211907. The cubic root of 100210421 is about 464.4842178651.

Adding to 100210421 its reverse (124012001), we get a palindrome (224222422).

The spelling of 100210421 in words is "one hundred million, two hundred ten thousand, four hundred twenty-one".