3756003221 has 4 divisors (see below), whose sum is σ = 3756720000. Its totient is φ = 3755286444.

The previous prime is 3756003217. The next prime is 3756003241. The reversal of 3756003221 is 1223006573.

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: 1223006573 = 19 ⋅64368767.

It is a cyclic number.

It is not a de Polignac number, because 3756003221 - 2² = 3756003217 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 (3756003211) 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, 350471 + ... + 361028.

It is an arithmetic number, because the mean of its divisors is an integer number (939180000).

Almost surely, 2^3756003221 is an apocalyptic number.

It is an amenable number.

3756003221 is a deficient number, since it is larger than the sum of its proper divisors (716779).

3756003221 is an equidigital number, since it uses as much as digits as its factorization.

3756003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716778.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 3756003221 is about 61286.2400625132. The cubic root of 3756003221 is about 1554.4448511304. Note that the first 3 decimals are identical.

Adding to 3756003221 its reverse (1223006573), we get a palindrome (4979009794).

The spelling of 3756003221 in words is "three billion, seven hundred fifty-six million, three thousand, two hundred twenty-one".