723112021 has 8 divisors (see below), whose sum is σ = 726276824. Its totient is φ = 719953920.

The previous prime is 723112003. The next prime is 723112031. The reversal of 723112021 is 120211327.

It can be written as a sum of positive squares in 4 ways, for example, as 1920996 + 721191025 = 1386^2 + 26855^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 723112021 - 2⁵ = 723111989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 723112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723112031) 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, 387631 + ... + 389491.

It is an arithmetic number, because the mean of its divisors is an integer number (90784603).

Almost surely, 2^723112021 is an apocalyptic number.

It is an amenable number.

723112021 is a deficient number, since it is larger than the sum of its proper divisors (3164803).

723112021 is a wasteful number, since it uses less digits than its factorization.

723112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3351.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 723112021 is about 26890.7422917256. The cubic root of 723112021 is about 897.5704104929.

Adding to 723112021 its reverse (120211327), we get a palindrome (843323348).

The spelling of 723112021 in words is "seven hundred twenty-three million, one hundred twelve thousand, twenty-one".