3721144521 has 4 divisors (see below), whose sum is σ = 4961526032. Its totient is φ = 2480763012.

The previous prime is 3721144513. The next prime is 3721144529. The reversal of 3721144521 is 1254411273.

3721144521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 1254411273 = 3 ⋅418137091.

It is an interprime number because it is at equal distance from previous prime (3721144513) and next prime (3721144529).

It is not a de Polignac number, because 3721144521 - 2³ = 3721144513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721144529) 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, 620190751 + ... + 620190756.

It is an arithmetic number, because the mean of its divisors is an integer number (1240381508).

Almost surely, 2^3721144521 is an apocalyptic number.

It is an amenable number.

3721144521 is a deficient number, since it is larger than the sum of its proper divisors (1240381511).

3721144521 is a wasteful number, since it uses less digits than its factorization.

3721144521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240381510.

The product of its digits is 6720, while the sum is 30.

The square root of 3721144521 is about 61001.1845868586. The cubic root of 3721144521 is about 1549.6210687986.

Adding to 3721144521 its reverse (1254411273), we get a palindrome (4975555794).

The spelling of 3721144521 in words is "three billion, seven hundred twenty-one million, one hundred forty-four thousand, five hundred twenty-one".