5721121 has 4 divisors (see below), whose sum is σ = 6538432. Its totient is φ = 4903812.

The previous prime is 5721119. The next prime is 5721127. The reversal of 5721121 is 1211275.

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 5721121 - 2¹ = 5721119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5721127) 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, 408645 + ... + 408658.

It is an arithmetic number, because the mean of its divisors is an integer number (1634608).

Almost surely, 2^5721121 is an apocalyptic number.

It is an amenable number.

5721121 is a deficient number, since it is larger than the sum of its proper divisors (817311).

5721121 is an equidigital number, since it uses as much as digits as its factorization.

5721121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817310.

The product of its digits is 140, while the sum is 19.

The square root of 5721121 is about 2391.8864939625. The cubic root of 5721121 is about 178.8519629527.

Adding to 5721121 its reverse (1211275), we get a palindrome (6932396).

The spelling of 5721121 in words is "five million, seven hundred twenty-one thousand, one hundred twenty-one".