721012841 has 4 divisors (see below), whose sum is σ = 728151684. Its totient is φ = 713874000.

The previous prime is 721012793. The next prime is 721012847. The reversal of 721012841 is 148210127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 667137241 + 53875600 = 25829^2 + 7340^2 .

It is a cyclic number.

It is not a de Polignac number, because 721012841 - 2²² = 716818537 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 721012841.

It is not an unprimeable number, because it can be changed into a prime (721012847) 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, 3569270 + ... + 3569471.

It is an arithmetic number, because the mean of its divisors is an integer number (182037921).

Almost surely, 2^721012841 is an apocalyptic number.

It is an amenable number.

721012841 is a deficient number, since it is larger than the sum of its proper divisors (7138843).

721012841 is a wasteful number, since it uses less digits than its factorization.

721012841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138842.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 721012841 is about 26851.6822750456. The cubic root of 721012841 is about 896.7010255871.

Adding to 721012841 its reverse (148210127), we get a palindrome (869222968).

The spelling of 721012841 in words is "seven hundred twenty-one million, twelve thousand, eight hundred forty-one".