100021421 has 8 divisors (see below), whose sum is σ = 106375680. Its totient is φ = 93719488.

The previous prime is 100021409. The next prime is 100021429. The reversal of 100021421 is 124120001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100021421 - 2²² = 95827117 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 (100021429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9101 + ... + 16818.

It is an arithmetic number, because the mean of its divisors is an integer number (13296960).

Almost surely, 2^100021421 is an apocalyptic number.

It is an amenable number.

100021421 is a deficient number, since it is larger than the sum of its proper divisors (6354259).

100021421 is a wasteful number, since it uses less digits than its factorization.

100021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26163.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 100021421 is about 10001.0709926487. The cubic root of 100021421 is about 464.1920234865.

Adding to 100021421 its reverse (124120001), we get a palindrome (224141422).

The spelling of 100021421 in words is "one hundred million, twenty-one thousand, four hundred twenty-one".