100006621 has 12 divisors (see below), whose sum is σ = 118382236. Its totient is φ = 83920320.

The previous prime is 100006609. The next prime is 100006637. The reversal of 100006621 is 126600001.

It can be written as a sum of positive squares in 2 ways, for example, as 60140025 + 39866596 = 7755^2 + 6314^2 .

It is not a de Polignac number, because 100006621 - 2⁷ = 100006493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100006595 and 100006604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100006661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30216 + ... + 33361.

Almost surely, 2^100006621 is an apocalyptic number.

100006621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100006621 is a deficient number, since it is larger than the sum of its proper divisors (18375615).

100006621 is a wasteful number, since it uses less digits than its factorization.

100006621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63612 (or 63601 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 100006621 is about 10000.3310445205. The cubic root of 100006621 is about 464.1691271218.

Adding to 100006621 its reverse (126600001), we get a palindrome (226606622).

The spelling of 100006621 in words is "one hundred million, six thousand, six hundred twenty-one".