100242421 has 4 divisors (see below), whose sum is σ = 106139052. Its totient is φ = 94345792.

The previous prime is 100242409. The next prime is 100242427. The reversal of 100242421 is 124242001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55204900 + 45037521 = 7430^2 + 6711^2 .

It is a cyclic number.

It is not a de Polignac number, because 100242421 - 2⁷ = 100242293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100242395 and 100242404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100242427) 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, 2948290 + ... + 2948323.

It is an arithmetic number, because the mean of its divisors is an integer number (26534763).

Almost surely, 2^100242421 is an apocalyptic number.

It is an amenable number.

100242421 is a deficient number, since it is larger than the sum of its proper divisors (5896631).

100242421 is an equidigital number, since it uses as much as digits as its factorization.

100242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896630.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 100242421 is about 10012.1137128980. The cubic root of 100242421 is about 464.5336535526.

Adding to 100242421 its reverse (124242001), we get a palindrome (224484422).

The spelling of 100242421 in words is "one hundred million, two hundred forty-two thousand, four hundred twenty-one".