2157178432342 has 8 divisors (see below), whose sum is σ = 3242200587696. Its totient is φ = 1076444903112.

The previous prime is 2157178432327. The next prime is 2157178432361. The reversal of 2157178432342 is 2432348717512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2157178432342² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072155273 + ... + 1072157284.

It is an arithmetic number, because the mean of its divisors is an integer number (405275073462).

Almost surely, 2^{2157178432342} is an apocalyptic number.

2157178432342 is a deficient number, since it is larger than the sum of its proper divisors (1085022155354).

2157178432342 is a wasteful number, since it uses less digits than its factorization.

2157178432342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144313062.

The product of its digits is 2257920, while the sum is 49.

The spelling of 2157178432342 in words is "two trillion, one hundred fifty-seven billion, one hundred seventy-eight million, four hundred thirty-two thousand, three hundred forty-two".