100000018421 has 2 divisors, whose sum is σ = 100000018422. Its totient is φ = 100000018420.

The previous prime is 100000018411. The next prime is 100000018439. The reversal of 100000018421 is 124810000001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99976116100 + 23902321 = 316190^2 + 4889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100000018421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100000018421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100000018411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000009210 + 50000009211.

It is an arithmetic number, because the mean of its divisors is an integer number (50000009211).

Almost surely, 2^100000018421 is an apocalyptic number.

It is an amenable number.

100000018421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000018421 is an equidigital number, since it uses as much as digits as its factorization.

100000018421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 100000018421 its reverse (124810000001), we get a palindrome (224810018422).

The spelling of 100000018421 in words is "one hundred billion, eighteen thousand, four hundred twenty-one".