4102921 has 4 divisors (see below), whose sum is σ = 4170244. Its totient is φ = 4035600.

The previous prime is 4102909. The next prime is 4102927. The reversal of 4102921 is 1292014.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1334025 + 2768896 = 1155^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 4102921 - 2⁷ = 4102793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4102927) 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, 33570 + ... + 33691.

It is an arithmetic number, because the mean of its divisors is an integer number (1042561).

Almost surely, 2^4102921 is an apocalyptic number.

It is an amenable number.

4102921 is a deficient number, since it is larger than the sum of its proper divisors (67323).

4102921 is an equidigital number, since it uses as much as digits as its factorization.

4102921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67322.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 4102921 is about 2025.5668342467. The cubic root of 4102921 is about 160.0900664782.

Adding to 4102921 its reverse (1292014), we get a palindrome (5394935).

The spelling of 4102921 in words is "four million, one hundred two thousand, nine hundred twenty-one".