100855121 has 16 divisors (see below), whose sum is σ = 108208128. Its totient is φ = 93830400.

The previous prime is 100855103. The next prime is 100855129. The reversal of 100855121 is 121558001.

It is a cyclic number.

It is not a de Polignac number, because 100855121 - 2¹⁰ = 100854097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100855129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92240 + ... + 93326.

It is an arithmetic number, because the mean of its divisors is an integer number (6763008).

Almost surely, 2^100855121 is an apocalyptic number.

It is an amenable number.

100855121 is a deficient number, since it is larger than the sum of its proper divisors (7353007).

100855121 is a wasteful number, since it uses less digits than its factorization.

100855121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 100855121 is about 10042.6650347405. The cubic root of 100855121 is about 465.4781700061.

The spelling of 100855121 in words is "one hundred million, eight hundred fifty-five thousand, one hundred twenty-one".