721146443 has 4 divisors (see below), whose sum is σ = 763566840. Its totient is φ = 678726048.

The previous prime is 721146367. The next prime is 721146473. The reversal of 721146443 is 344641127.

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

It is a cyclic number.

It is not a de Polignac number, because 721146443 - 2¹⁰ = 721145419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721146473) 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, 21210173 + ... + 21210206.

It is an arithmetic number, because the mean of its divisors is an integer number (190891710).

Almost surely, 2^721146443 is an apocalyptic number.

721146443 is a deficient number, since it is larger than the sum of its proper divisors (42420397).

721146443 is a wasteful number, since it uses less digits than its factorization.

721146443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42420396.

The product of its digits is 16128, while the sum is 32.

The square root of 721146443 is about 26854.1699369018. The cubic root of 721146443 is about 896.7564077036.

The spelling of 721146443 in words is "seven hundred twenty-one million, one hundred forty-six thousand, four hundred forty-three".