28223111221591 has 36 divisors (see below), whose sum is σ = 34600153127176. Its totient is φ = 22867048290240.

The previous prime is 28223111221567. The next prime is 28223111221609. The reversal of 28223111221591 is 19512211132282.

It is not a de Polignac number, because 28223111221591 - 2¹¹ = 28223111219543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28223111224591) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9344301 + ... + 11990086.

Almost surely, 2^{28223111221591} is an apocalyptic number.

28223111221591 is a deficient number, since it is larger than the sum of its proper divisors (6377041905585).

28223111221591 is a wasteful number, since it uses less digits than its factorization.

28223111221591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21334480 (or 21334440 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The spelling of 28223111221591 in words is "twenty-eight trillion, two hundred twenty-three billion, one hundred eleven million, two hundred twenty-one thousand, five hundred ninety-one".