721561033442 has 8 divisors (see below), whose sum is σ = 1082467094016. Its totient is φ = 360738668772.

The previous prime is 721561033433. The next prime is 721561033469. The reversal of 721561033442 is 244330165127.

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

It is a junction number, because it is equal to n+sod(n) for n = 721561033396 and 721561033405.

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, 20902418 + ... + 20936909.

It is an arithmetic number, because the mean of its divisors is an integer number (135308386752).

Almost surely, 2^721561033442 is an apocalyptic number.

721561033442 is a deficient number, since it is larger than the sum of its proper divisors (360906060574).

721561033442 is a wasteful number, since it uses less digits than its factorization.

721561033442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41847952.

The product of its (nonzero) digits is 120960, while the sum is 38.

Adding to 721561033442 its reverse (244330165127), we get a palindrome (965891198569).

The spelling of 721561033442 in words is "seven hundred twenty-one billion, five hundred sixty-one million, thirty-three thousand, four hundred forty-two".