3138428376721 has 13 divisors (see below), whose sum is σ = 3452271214393. Its totient is φ = 2853116706110.

The previous prime is 3138428376689. The next prime is 3138428376749. The reversal of 3138428376721 is 1276738248313.

The square root of 3138428376721 is 1771561.

The cubic root of 3138428376721 is 14641.

It is a perfect power (a square, a cube, a biquadrate, a 6-th power, a 12-th power), and thus also a powerful number.

3138428376721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an ABA number since it can be written as A⋅B^A, here for A=11, B=11.

It is not a de Polignac number, because 3138428376721 - 2⁵ = 3138428376689 is a prime.

It is a super-2 number, since 2×3138428376721² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (3138428379721) by changing a digit.

It is a polite number, since it can be written in 12 ways as a sum of consecutive naturals, for example, 285311670606 + ... + 285311670616.

Almost surely, 2^{3138428376721} is an apocalyptic number.

3138428376721 is the 1771561-st square number.

3138428376721 is the 885781-st centered octagonal number.

It is an amenable number.

3138428376721 is a deficient number, since it is larger than the sum of its proper divisors (313842837672).

3138428376721 is an frugal number, since it uses more digits than its factorization.

3138428376721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 11 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 55.

The spelling of 3138428376721 in words is "three trillion, one hundred thirty-eight billion, four hundred twenty-eight million, three hundred seventy-six thousand, seven hundred twenty-one".