3512821 has 4 divisors (see below), whose sum is σ = 3783052. Its totient is φ = 3242592.

The previous prime is 3512819. The next prime is 3512837. The reversal of 3512821 is 1282153.

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 790321 + 2722500 = 889^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 3512821 - 2¹ = 3512819 is a prime.

It is a super-2 number, since 2×3512821² = 24679822756082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3512792 and 3512801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3512851) 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, 135096 + ... + 135121.

It is an arithmetic number, because the mean of its divisors is an integer number (945763).

Almost surely, 2^3512821 is an apocalyptic number.

It is an amenable number.

3512821 is a deficient number, since it is larger than the sum of its proper divisors (270231).

3512821 is a wasteful number, since it uses less digits than its factorization.

3512821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270230.

The product of its digits is 480, while the sum is 22.

The square root of 3512821 is about 1874.2521175125. The cubic root of 3512821 is about 152.0146136688.

Adding to 3512821 its reverse (1282153), we get a palindrome (4794974).

The spelling of 3512821 in words is "three million, five hundred twelve thousand, eight hundred twenty-one".