4921621 has 4 divisors (see below), whose sum is σ = 4984000. Its totient is φ = 4859244.

The previous prime is 4921613. The next prime is 4921643. The reversal of 4921621 is 1261294.

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 4921621 - 2³ = 4921613 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 (4921601) 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, 31071 + ... + 31228.

It is an arithmetic number, because the mean of its divisors is an integer number (1246000).

Almost surely, 2^4921621 is an apocalyptic number.

It is an amenable number.

4921621 is a deficient number, since it is larger than the sum of its proper divisors (62379).

4921621 is an equidigital number, since it uses as much as digits as its factorization.

4921621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62378.

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

The square root of 4921621 is about 2218.4726728089. The cubic root of 4921621 is about 170.0993767289.

The spelling of 4921621 in words is "four million, nine hundred twenty-one thousand, six hundred twenty-one".