100100421 has 16 divisors (see below), whose sum is σ = 149123520. Its totient is φ = 66361680.

The previous prime is 100100401. The next prime is 100100423. The reversal of 100100421 is 124001001.

It is a happy number.

It is not a de Polignac number, because 100100421 - 2⁵ = 100100389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100100423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5355 + ... + 15128.

It is an arithmetic number, because the mean of its divisors is an integer number (9320220).

Almost surely, 2^100100421 is an apocalyptic number.

It is an amenable number.

100100421 is a deficient number, since it is larger than the sum of its proper divisors (49023099).

100100421 is a wasteful number, since it uses less digits than its factorization.

100100421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20673 (or 20667 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 100100421 is about 10005.0197900854. The cubic root of 100100421 is about 464.3142023793.

Adding to 100100421 its reverse (124001001), we get a palindrome (224101422).

The spelling of 100100421 in words is "one hundred million, one hundred thousand, four hundred twenty-one".