128100283921 has 7 divisors (see below), whose sum is σ = 129930287977. Its totient is φ = 126296054570.

The previous prime is 128100283859. The next prime is 128100283939. The reversal of 128100283921 is 129382001821.

The square root of 128100283921 is 357911.

The cubic root of 128100283921 is 5041.

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

It is not a de Polignac number, because 128100283921 - 2¹¹ = 128100281873 is a prime.

It is a super-2 number, since 2×128100283921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128100283721) by changing a digit.

It is a polite number, since it can be written in 6 ways as a sum of consecutive naturals, for example, 1804229316 + ... + 1804229386.

It is an arithmetic number, because the mean of its divisors is an integer number (18561469711).

Almost surely, 2^128100283921 is an apocalyptic number.

128100283921 is the 357911-st square number.

128100283921 is the 178956-th centered octagonal number.

It is an amenable number.

128100283921 is a deficient number, since it is larger than the sum of its proper divisors (1830004056).

128100283921 is an frugal number, since it uses more digits than its factorization.

128100283921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 128100283921 in words is "one hundred twenty-eight billion, one hundred million, two hundred eighty-three thousand, nine hundred twenty-one".