100121131 has 4 divisors (see below), whose sum is σ = 109223064. Its totient is φ = 91019200.

The previous prime is 100121129. The next prime is 100121141. The reversal of 100121131 is 131121001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100121131 - 2¹ = 100121129 is a prime.

It is a super-2 number, since 2×100121131² = 20048481745438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100121111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4550950 + ... + 4550971.

It is an arithmetic number, because the mean of its divisors is an integer number (27305766).

Almost surely, 2^100121131 is an apocalyptic number.

100121131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100121131 is a deficient number, since it is larger than the sum of its proper divisors (9101933).

100121131 is an equidigital number, since it uses as much as digits as its factorization.

100121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9101932.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 100121131 is about 10006.0547170201. The cubic root of 100121131 is about 464.3462211726.

Adding to 100121131 its reverse (131121001), we get a palindrome (231242132).

The spelling of 100121131 in words is "one hundred million, one hundred twenty-one thousand, one hundred thirty-one".