5205921 has 8 divisors (see below), whose sum is σ = 7932864. Its totient is φ = 2974800.

The previous prime is 5205917. The next prime is 5205931. The reversal of 5205921 is 1295025.

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

It is not a de Polignac number, because 5205921 - 2² = 5205917 is a prime.

It is a super-2 number, since 2×5205921² = 54203226916482, which contains 22 as substring.

5205921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5205891 and 5205900.

It is not an unprimeable number, because it can be changed into a prime (5205901) 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, 123930 + ... + 123971.

It is an arithmetic number, because the mean of its divisors is an integer number (991608).

Almost surely, 2^5205921 is an apocalyptic number.

It is an amenable number.

5205921 is a deficient number, since it is larger than the sum of its proper divisors (2726943).

5205921 is a wasteful number, since it uses less digits than its factorization.

5205921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247911.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 5205921 is about 2281.6487459730. The cubic root of 5205921 is about 173.3135525586.

It can be divided in two parts, 520 and 5921, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 5205921 in words is "five million, two hundred five thousand, nine hundred twenty-one".