4100021 has 4 divisors (see below), whose sum is σ = 4152000. Its totient is φ = 4048044.

The previous prime is 4100011. The next prime is 4100023. The reversal of 4100021 is 1200014.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4100021 - 2¹⁴ = 4083637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4099981 and 4100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4100023) 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, 25871 + ... + 26028.

It is an arithmetic number, because the mean of its divisors is an integer number (1038000).

Almost surely, 2^4100021 is an apocalyptic number.

It is an amenable number.

4100021 is a deficient number, since it is larger than the sum of its proper divisors (51979).

4100021 is an equidigital number, since it uses as much as digits as its factorization.

4100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51978.

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

The square root of 4100021 is about 2024.8508587054. The cubic root of 4100021 is about 160.0523396475.

Adding to 4100021 its reverse (1200014), we get a palindrome (5300035).

The spelling of 4100021 in words is "four million, one hundred thousand, twenty-one".