2194920721728 has 280 divisors, whose sum is σ = 7442872941504. Its totient is φ = 626534092800.

The previous prime is 2194920721661. The next prime is 2194920721793. The reversal of 2194920721728 is 8271270294912.

2194920721728 is a `hidden beast` number, since 2 + 19 + 492 + 0 + 72 + 1 + 72 + 8 = 666.

It is a super-2 number, since 2×2194920721728² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39562488 + ... + 39617928.

Almost surely, 2^{2194920721728} is an apocalyptic number.

2194920721728 is a gapful number since it is divisible by the number (28) 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 2194920721728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3721436470752).

2194920721728 is an abundant number, since it is smaller than the sum of its proper divisors (5247952219776).

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

2194920721728 is a wasteful number, since it uses less digits than its factorization.

2194920721728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56563 (or 56544 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 2194920721728 in words is "two trillion, one hundred ninety-four billion, nine hundred twenty million, seven hundred twenty-one thousand, seven hundred twenty-eight".