100408421 has 2 divisors, whose sum is σ = 100408422. Its totient is φ = 100408420.

The previous prime is 100408381. The next prime is 100408433. The reversal of 100408421 is 124804001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 36168196 = 8015^2 + 6014^2 .

It is a cyclic number.

It is not a de Polignac number, because 100408421 - 2²² = 96214117 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100408393 and 100408402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100408621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50204210 + 50204211.

It is an arithmetic number, because the mean of its divisors is an integer number (50204211).

Almost surely, 2^100408421 is an apocalyptic number.

It is an amenable number.

100408421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100408421 is an equidigital number, since it uses as much as digits as its factorization.

100408421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 100408421 is about 10020.4002415073. The cubic root of 100408421 is about 464.7899324781.

The spelling of 100408421 in words is "one hundred million, four hundred eight thousand, four hundred twenty-one".