10721106781 has 8 divisors (see below), whose sum is σ = 13366574784. Its totient is φ = 8354109120.

The previous prime is 10721106779. The next prime is 10721106829. The reversal of 10721106781 is 18760112701.

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

It is not a de Polignac number, because 10721106781 - 2¹ = 10721106779 is a prime.

It is a super-2 number, since 2×10721106781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10721106731) 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, 69617500 + ... + 69617653.

It is an arithmetic number, because the mean of its divisors is an integer number (1670821848).

Almost surely, 2^10721106781 is an apocalyptic number.

10721106781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10721106781 is a deficient number, since it is larger than the sum of its proper divisors (2645468003).

10721106781 is a wasteful number, since it uses less digits than its factorization.

10721106781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139235171.

The product of its (nonzero) digits is 4704, while the sum is 34.

The spelling of 10721106781 in words is "ten billion, seven hundred twenty-one million, one hundred six thousand, seven hundred eighty-one".