2191128273940 has 24 divisors (see below), whose sum is σ = 4601448754560. Its totient is φ = 876436189728.

The previous prime is 2191128273907. The next prime is 2191128273947. The reversal of 2191128273940 is 493728211912.

It is a super-2 number, since 2×2191128273940² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191128273947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282201 + ... + 2112319.

It is an arithmetic number, because the mean of its divisors is an integer number (191727031440).

Almost surely, 2^{2191128273940} is an apocalyptic number.

2191128273940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191128273940 is an abundant number, since it is smaller than the sum of its proper divisors (2410320480620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191128273940 is a wasteful number, since it uses less digits than its factorization.

2191128273940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889991 (or 1889989 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 2191128273940 in words is "two trillion, one hundred ninety-one billion, one hundred twenty-eight million, two hundred seventy-three thousand, nine hundred forty".