1672351221 has 8 divisors (see below), whose sum is σ = 2232704320. Its totient is φ = 1113449472.

The previous prime is 1672351199. The next prime is 1672351223. The reversal of 1672351221 is 1221532761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1672351221 - 2⁵ = 1672351189 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 (1672351223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360145 + ... + 364758.

It is an arithmetic number, because the mean of its divisors is an integer number (279088040).

Almost surely, 2^1672351221 is an apocalyptic number.

It is an amenable number.

1672351221 is a deficient number, since it is larger than the sum of its proper divisors (560353099).

1672351221 is an equidigital number, since it uses as much as digits as its factorization.

1672351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725675.

The product of its digits is 5040, while the sum is 30.

The square root of 1672351221 is about 40894.3910701700. The cubic root of 1672351221 is about 1186.9775287703.

Adding to 1672351221 its reverse (1221532761), we get a palindrome (2893883982).

The spelling of 1672351221 in words is "one billion, six hundred seventy-two million, three hundred fifty-one thousand, two hundred twenty-one".