3240516821 has 4 divisors (see below), whose sum is σ = 3241736352. Its totient is φ = 3239297292.

The previous prime is 3240516817. The next prime is 3240516827. The reversal of 3240516821 is 1286150423.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1286150423 = 6389 ⋅201307.

It is a cyclic number.

It is not a de Polignac number, because 3240516821 - 2² = 3240516817 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 (3240516827) 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, 605771 + ... + 611096.

It is an arithmetic number, because the mean of its divisors is an integer number (810434088).

Almost surely, 2^3240516821 is an apocalyptic number.

It is an amenable number.

3240516821 is a deficient number, since it is larger than the sum of its proper divisors (1219531).

3240516821 is a wasteful number, since it uses less digits than its factorization.

3240516821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219530.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 3240516821 is about 56925.5375117355. The cubic root of 3240516821 is about 1479.8059188221.

The spelling of 3240516821 in words is "three billion, two hundred forty million, five hundred sixteen thousand, eight hundred twenty-one".