100155621 has 4 divisors (see below), whose sum is σ = 133540832. Its totient is φ = 66770412.

The previous prime is 100155617. The next prime is 100155623. The reversal of 100155621 is 126551001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100155621 - 2² = 100155617 is a prime.

It is a super-2 number, since 2×100155621² = 20062296835791282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100155623) 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 3 ways as a sum of consecutive naturals, for example, 16692601 + ... + 16692606.

It is an arithmetic number, because the mean of its divisors is an integer number (33385208).

Almost surely, 2^100155621 is an apocalyptic number.

It is an amenable number.

100155621 is a deficient number, since it is larger than the sum of its proper divisors (33385211).

100155621 is an equidigital number, since it uses as much as digits as its factorization.

100155621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33385210.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 100155621 is about 10007.7780251163. The cubic root of 100155621 is about 464.3995348016.

The spelling of 100155621 in words is "one hundred million, one hundred fifty-five thousand, six hundred twenty-one".