2471221 has 4 divisors (see below), whose sum is σ = 2478892. Its totient is φ = 2463552.

The previous prime is 2471219. The next prime is 2471233. The reversal of 2471221 is 1221742.

It is a happy number.

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 236196 + 2235025 = 486^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2471221 - 2¹ = 2471219 is a prime.

It is a super-2 number, since 2×2471221² = 12213866461682, which contains 22 as substring.

It is a Duffinian number.

2471221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2471201) 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, 3330 + ... + 4003.

It is an arithmetic number, because the mean of its divisors is an integer number (619723).

2^2471221 is an apocalyptic number.

It is an amenable number.

2471221 is a deficient number, since it is larger than the sum of its proper divisors (7671).

2471221 is an equidigital number, since it uses as much as digits as its factorization.

2471221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670.

The product of its digits is 224, while the sum is 19.

The square root of 2471221 is about 1572.0117684038. The cubic root of 2471221 is about 135.1980814183.

Adding to 2471221 its reverse (1221742), we get a palindrome (3692963).

The spelling of 2471221 in words is "two million, four hundred seventy-one thousand, two hundred twenty-one".