100521021 has 8 divisors (see below), whose sum is σ = 134251264. Its totient is φ = 66902400.

The previous prime is 100521013. The next prime is 100521037. The reversal of 100521021 is 120125001.

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

It is not a de Polignac number, because 100521021 - 2³ = 100521013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100520988 and 100521006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100521011) 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, 25780 + ... + 29421.

It is an arithmetic number, because the mean of its divisors is an integer number (16781408).

Almost surely, 2^100521021 is an apocalyptic number.

It is an amenable number.

100521021 is a deficient number, since it is larger than the sum of its proper divisors (33730243).

100521021 is an equidigital number, since it uses as much as digits as its factorization.

100521021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55811.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 100521021 is about 10026.0172052515. The cubic root of 100521021 is about 464.9636091304.

Adding to 100521021 its reverse (120125001), we get a palindrome (220646022).

The spelling of 100521021 in words is "one hundred million, five hundred twenty-one thousand, twenty-one".