726011021 has 4 divisors (see below), whose sum is σ = 741458112. Its totient is φ = 710563932.

The previous prime is 726010981. The next prime is 726011023. The reversal of 726011021 is 120110627.

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.

It is a cyclic number.

It is not a de Polignac number, because 726011021 - 2¹⁰ = 726009997 is a prime.

It is a super-2 number, since 2×726011021² = 1054184005226924882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 726010984 and 726011002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726011023) 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 3 ways as a sum of consecutive naturals, for example, 7723475 + ... + 7723568.

It is an arithmetic number, because the mean of its divisors is an integer number (185364528).

Almost surely, 2^726011021 is an apocalyptic number.

It is an amenable number.

726011021 is a deficient number, since it is larger than the sum of its proper divisors (15447091).

726011021 is a wasteful number, since it uses less digits than its factorization.

726011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15447090.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 726011021 is about 26944.5916836756. The cubic root of 726011021 is about 898.7682825611.

Adding to 726011021 its reverse (120110627), we get a palindrome (846121648).

It can be divided in two parts, 7260 and 11021, that added together give a palindrome (18281).

The spelling of 726011021 in words is "seven hundred twenty-six million, eleven thousand, twenty-one".