10438139717721 has 15 divisors (see below), whose sum is σ = 15592820051941. Its totient is φ = 6958740426948.

The previous prime is 10438139717689. The next prime is 10438139717729. The reversal of 10438139717721 is 12771793183401.

The square root of 10438139717721 is 3230811.

It is a perfect power (a square), and thus also a powerful number.

10438139717721 is a `hidden beast` number, since 1 + 0 + 4 + 3 + 81 + 397 + 177 + 2 + 1 = 666.

It is not a de Polignac number, because 10438139717721 - 2⁵ = 10438139717689 is a prime.

It is a super-2 number, since 2×10438139717721² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10438139717729) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 28897810 + ... + 29256788.

Almost surely, 2^{10438139717721} is an apocalyptic number.

10438139717721 is the 3230811-st square number.

10438139717721 is the 1615406-th centered octagonal number.

It is an amenable number.

10438139717721 is a deficient number, since it is larger than the sum of its proper divisors (5154680334220).

10438139717721 is an frugal number, since it uses more digits than its factorization.

10438139717721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717970 (or 358982 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The spelling of 10438139717721 in words is "ten trillion, four hundred thirty-eight billion, one hundred thirty-nine million, seven hundred seventeen thousand, seven hundred twenty-one".