100421657 has 24 divisors (see below), whose sum is σ = 122739456. Its totient is φ = 80441856.

The previous prime is 100421653. The next prime is 100421681. The reversal of 100421657 is 756124001.

It is not a de Polignac number, because 100421657 - 2² = 100421653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100421653) 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 in 23 ways as a sum of consecutive naturals, for example, 173753 + ... + 174329.

It is an arithmetic number, because the mean of its divisors is an integer number (5114144).

Almost surely, 2^100421657 is an apocalyptic number.

It is an amenable number.

100421657 is a deficient number, since it is larger than the sum of its proper divisors (22317799).

100421657 is an equidigital number, since it uses as much as digits as its factorization.

100421657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 100421657 is about 10021.0606724039. The cubic root of 100421657 is about 464.8103547002.

Adding to 100421657 its reverse (756124001), we get a palindrome (856545658).

The spelling of 100421657 in words is "one hundred million, four hundred twenty-one thousand, six hundred fifty-seven".