100421425 has 12 divisors (see below), whose sum is σ = 134101660. Its totient is φ = 74157120.

The previous prime is 100421417. The next prime is 100421429. The reversal of 100421425 is 524124001.

It can be written as a sum of positive squares in 6 ways, for example, as 27164944 + 73256481 = 5212^2 + 8559^2 .

It is not a de Polignac number, because 100421425 - 2³ = 100421417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100421429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154170 + ... + 154819.

Almost surely, 2^100421425 is an apocalyptic number.

It is an amenable number.

100421425 is a deficient number, since it is larger than the sum of its proper divisors (33680235).

100421425 is a wasteful number, since it uses less digits than its factorization.

100421425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309012 (or 309007 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 100421425 is about 10021.0490967762. The cubic root of 100421425 is about 464.8099967559.

Adding to 100421425 its reverse (524124001), we get a palindrome (624545426).

The spelling of 100421425 in words is "one hundred million, four hundred twenty-one thousand, four hundred twenty-five".