2151178722000 has 1600 divisors, whose sum is σ = 10001842126848. Its totient is φ = 432501120000.

The previous prime is 2151178721999. The next prime is 2151178722023. The reversal of 2151178722000 is 2278711512.

2151178722000 is a `hidden beast` number, since 2 + 1 + 511 + 78 + 72 + 2 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 319 ways as a sum of consecutive naturals, for example, 386691219 + ... + 386696781.

Almost surely, 2^{2151178722000} is an apocalyptic number.

2151178722000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151178722000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5000921063424).

2151178722000 is an abundant number, since it is smaller than the sum of its proper divisors (7850663404848).

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

2151178722000 is a wasteful number, since it uses less digits than its factorization.

2151178722000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5647 (or 5622 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The spelling of 2151178722000 in words is "two trillion, one hundred fifty-one billion, one hundred seventy-eight million, seven hundred twenty-two thousand".