100208621 has 2 divisors, whose sum is σ = 100208622. Its totient is φ = 100208620.

The previous prime is 100208593. The next prime is 100208627. The reversal of 100208621 is 126802001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94381225 + 5827396 = 9715^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 100208621 - 2²⁶ = 33099757 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100208593 and 100208602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100208627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50104310 + 50104311.

It is an arithmetic number, because the mean of its divisors is an integer number (50104311).

Almost surely, 2^100208621 is an apocalyptic number.

It is an amenable number.

100208621 is a deficient number, since it is larger than the sum of its proper divisors (1).

100208621 is an equidigital number, since it uses as much as digits as its factorization.

100208621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 100208621 is about 10010.4256153273. The cubic root of 100208621 is about 464.4814367951.

The spelling of 100208621 in words is "one hundred million, two hundred eight thousand, six hundred twenty-one".