723134221 has 4 divisors (see below), whose sum is σ = 723425632. Its totient is φ = 722842812.

The previous prime is 723134207. The next prime is 723134233. The reversal of 723134221 is 122431327.

It is a happy number.

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: 122431327 = 2371 ⋅51637.

It is a cyclic number.

It is not a de Polignac number, because 723134221 - 2¹¹ = 723132173 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 (723134201) 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, 141951 + ... + 146956.

It is an arithmetic number, because the mean of its divisors is an integer number (180856408).

Almost surely, 2^723134221 is an apocalyptic number.

It is an amenable number.

723134221 is a deficient number, since it is larger than the sum of its proper divisors (291411).

723134221 is a wasteful number, since it uses less digits than its factorization.

723134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291410.

The product of its digits is 2016, while the sum is 25.

The square root of 723134221 is about 26891.1550700226. The cubic root of 723134221 is about 897.5795957268.

Adding to 723134221 its reverse (122431327), we get a palindrome (845565548).

The spelling of 723134221 in words is "seven hundred twenty-three million, one hundred thirty-four thousand, two hundred twenty-one".