100121243 has 4 divisors (see below), whose sum is σ = 102449688. Its totient is φ = 97792800.

The previous prime is 100121237. The next prime is 100121251. The reversal of 100121243 is 342121001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342121001 = 61 ⋅5608541.

It is a cyclic number.

It is not a de Polignac number, because 100121243 - 2⁸ = 100120987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100121213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1164158 + ... + 1164243.

It is an arithmetic number, because the mean of its divisors is an integer number (25612422).

Almost surely, 2^100121243 is an apocalyptic number.

100121243 is a deficient number, since it is larger than the sum of its proper divisors (2328445).

100121243 is an equidigital number, since it uses as much as digits as its factorization.

100121243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328444.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 100121243 is about 10006.0603136299. The cubic root of 100121243 is about 464.3463943187.

Adding to 100121243 its reverse (342121001), we get a palindrome (442242244).

The spelling of 100121243 in words is "one hundred million, one hundred twenty-one thousand, two hundred forty-three".