100121943 has 4 divisors (see below), whose sum is σ = 133495928. Its totient is φ = 66747960.

The previous prime is 100121941. The next prime is 100121947. The reversal of 100121943 is 349121001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349121001 = 3 ⋅116373667.

It is not a de Polignac number, because 100121943 - 2¹ = 100121941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121941) 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, 16686988 + ... + 16686993.

It is an arithmetic number, because the mean of its divisors is an integer number (33373982).

Almost surely, 2^100121943 is an apocalyptic number.

100121943 is a deficient number, since it is larger than the sum of its proper divisors (33373985).

100121943 is an equidigital number, since it uses as much as digits as its factorization.

100121943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33373984.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 100121943 is about 10006.0952923705. The cubic root of 100121943 is about 464.3474764790.

Adding to 100121943 its reverse (349121001), we get a palindrome (449242944).

The spelling of 100121943 in words is "one hundred million, one hundred twenty-one thousand, nine hundred forty-three".