2157984391134 has 256 divisors, whose sum is σ = 5620099645440. Its totient is φ = 542045952000.

The previous prime is 2157984391037. The next prime is 2157984391163. The reversal of 2157984391134 is 4311934897512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32070177 + ... + 32137395.

It is an arithmetic number, because the mean of its divisors is an integer number (21953514240).

Almost surely, 2^{2157984391134} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157984391134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2810049822720).

2157984391134 is an abundant number, since it is smaller than the sum of its proper divisors (3462115254306).

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

2157984391134 is a wasteful number, since it uses less digits than its factorization.

2157984391134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67367.

The product of its digits is 6531840, while the sum is 57.

The spelling of 2157984391134 in words is "two trillion, one hundred fifty-seven billion, nine hundred eighty-four million, three hundred ninety-one thousand, one hundred thirty-four".