4621921 has 4 divisors (see below), whose sum is σ = 4865200. Its totient is φ = 4378644.

The previous prime is 4621913. The next prime is 4621931. The reversal of 4621921 is 1291264.

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 4621921 - 2³ = 4621913 is a prime.

It is a Duffinian number.

4621921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4621931) 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, 121611 + ... + 121648.

It is an arithmetic number, because the mean of its divisors is an integer number (1216300).

Almost surely, 2^4621921 is an apocalyptic number.

It is an amenable number.

4621921 is a deficient number, since it is larger than the sum of its proper divisors (243279).

4621921 is a wasteful number, since it uses less digits than its factorization.

4621921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243278.

The product of its digits is 864, while the sum is 25.

The square root of 4621921 is about 2149.8653446204. The cubic root of 4621921 is about 166.5741117221.

The spelling of 4621921 in words is "four million, six hundred twenty-one thousand, nine hundred twenty-one".