3214432721 has 4 divisors (see below), whose sum is σ = 3216161844. Its totient is φ = 3212703600.

The previous prime is 3214432699. The next prime is 3214432729. The reversal of 3214432721 is 1272344123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1272344123 = 37 ⋅34387679.

It can be written as a sum of positive squares in 2 ways, for example, as 44742721 + 3169690000 = 6689^2 + 56300^2 .

It is a cyclic number.

It is not a de Polignac number, because 3214432721 - 2¹⁰ = 3214431697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3214432729) 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, 861770 + ... + 865491.

It is an arithmetic number, because the mean of its divisors is an integer number (804040461).

Almost surely, 2^3214432721 is an apocalyptic number.

It is an amenable number.

3214432721 is a deficient number, since it is larger than the sum of its proper divisors (1729123).

3214432721 is a wasteful number, since it uses less digits than its factorization.

3214432721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729122.

The product of its digits is 8064, while the sum is 29.

The square root of 3214432721 is about 56695.9674139175. The cubic root of 3214432721 is about 1475.8247186789.

Adding to 3214432721 its reverse (1272344123), we get a palindrome (4486776844).

The spelling of 3214432721 in words is "three billion, two hundred fourteen million, four hundred thirty-two thousand, seven hundred twenty-one".