726271021 has 4 divisors (see below), whose sum is σ = 830024032. Its totient is φ = 622518012.

The previous prime is 726271003. The next prime is 726271079. The reversal of 726271021 is 120172627.

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 726271021 - 2⁷ = 726270893 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 (726271921) 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, 51876495 + ... + 51876508.

It is an arithmetic number, because the mean of its divisors is an integer number (207506008).

Almost surely, 2^726271021 is an apocalyptic number.

It is an amenable number.

726271021 is a deficient number, since it is larger than the sum of its proper divisors (103753011).

726271021 is a wasteful number, since it uses less digits than its factorization.

726271021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103753010.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 726271021 is about 26949.4159676977. The cubic root of 726271021 is about 898.8755591070.

The spelling of 726271021 in words is "seven hundred twenty-six million, two hundred seventy-one thousand, twenty-one".