721001042 has 8 divisors (see below), whose sum is σ = 1145119356. Its totient is φ = 339294592.

The previous prime is 721001027. The next prime is 721001077. The reversal of 721001042 is 240100127.

It can be written as a sum of positive squares in 2 ways, for example, as 694796881 + 26204161 = 26359^2 + 5119^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 721001042.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10602923 + ... + 10602990.

Almost surely, 2^721001042 is an apocalyptic number.

721001042 is a deficient number, since it is larger than the sum of its proper divisors (424118314).

721001042 is a wasteful number, since it uses less digits than its factorization.

721001042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21205932.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 721001042 is about 26851.4625672420. The cubic root of 721001042 is about 896.6961342118.

Adding to 721001042 its reverse (240100127), we get a palindrome (961101169).

The spelling of 721001042 in words is "seven hundred twenty-one million, one thousand, forty-two".