28151121081 has 16 divisors (see below), whose sum is σ = 38339481600. Its totient is φ = 18365213328.

The previous prime is 28151121067. The next prime is 28151121109. The reversal of 28151121081 is 18012115182.

It is not a de Polignac number, because 28151121081 - 2¹⁴ = 28151104697 is a prime.

It is a super-2 number, since 2×28151121081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28151121781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1232160 + ... + 1254798.

It is an arithmetic number, because the mean of its divisors is an integer number (2396217600).

Almost surely, 2^28151121081 is an apocalyptic number.

It is an amenable number.

28151121081 is a deficient number, since it is larger than the sum of its proper divisors (10188360519).

28151121081 is a wasteful number, since it uses less digits than its factorization.

28151121081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31508.

The product of its (nonzero) digits is 1280, while the sum is 30.

The spelling of 28151121081 in words is "twenty-eight billion, one hundred fifty-one million, one hundred twenty-one thousand, eighty-one".