721116242781 has 8 divisors (see below), whose sum is σ = 1048896353184. Its totient is φ = 437040147120.

The previous prime is 721116242767. The next prime is 721116242839. The reversal of 721116242781 is 187242611127.

It is a happy number.

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

It is not a de Polignac number, because 721116242781 - 2¹⁰ = 721116241757 is a prime.

It is a super-2 number, since 2×721116242781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721116242731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10926003646 + ... + 10926003711.

It is an arithmetic number, because the mean of its divisors is an integer number (131112044148).

Almost surely, 2^721116242781 is an apocalyptic number.

It is an amenable number.

721116242781 is a deficient number, since it is larger than the sum of its proper divisors (327780110403).

721116242781 is a wasteful number, since it uses less digits than its factorization.

721116242781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21852007371.

The product of its digits is 75264, while the sum is 42.

The spelling of 721116242781 in words is "seven hundred twenty-one billion, one hundred sixteen million, two hundred forty-two thousand, seven hundred eighty-one".