724011021 has 8 divisors (see below), whose sum is σ = 1072608960. Its totient is φ = 482673996.

The previous prime is 724010993. The next prime is 724011023. The reversal of 724011021 is 120110427.

It is not a de Polignac number, because 724011021 - 2⁷ = 724010893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 724010985 and 724011003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13407585 + ... + 13407638.

It is an arithmetic number, because the mean of its divisors is an integer number (134076120).

Almost surely, 2^724011021 is an apocalyptic number.

It is an amenable number.

724011021 is a deficient number, since it is larger than the sum of its proper divisors (348597939).

724011021 is a wasteful number, since it uses less digits than its factorization.

724011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26815232 (or 26815226 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 724011021 is about 26907.4528894877. The cubic root of 724011021 is about 897.9422208581.

Adding to 724011021 its reverse (120110427), we get a palindrome (844121448).

The spelling of 724011021 in words is "seven hundred twenty-four million, eleven thousand, twenty-one".