921428971868160 has 2496 divisors, whose sum is σ = 4007145357895680. Its totient is φ = 198611411927040.

The previous prime is 921428971868089. The next prime is 921428971868201. The reversal of 921428971868160 is 61868179824129.

921428971868160 is a `hidden beast` number, since 9 + 2 + 1 + 4 + 289 + 7 + 186 + 8 + 160 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 43441079955 + ... + 43441101165.

It is an arithmetic number, because the mean of its divisors is an integer number (1605426826080).

Almost surely, 2^{921428971868160} is an apocalyptic number.

921428971868160 is a gapful number since it is divisible by the number (90) 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 921428971868160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2003572678947840).

921428971868160 is an abundant number, since it is smaller than the sum of its proper divisors (3085716386027520).

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

921428971868160 is a wasteful number, since it uses less digits than its factorization.

921428971868160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21334 (or 21300 counting only the distinct ones).

The product of its (nonzero) digits is 167215104, while the sum is 72.

The spelling of 921428971868160 in words is "nine hundred twenty-one trillion, four hundred twenty-eight billion, nine hundred seventy-one million, eight hundred sixty-eight thousand, one hundred sixty".