2144621905920 has 768 divisors, whose sum is σ = 8693062560000. Its totient is φ = 496839426048.

The previous prime is 2144621905901. The next prime is 2144621905931. The reversal of 2144621905920 is 295091264412.

2144621905920 is a `hidden beast` number, since 2 + 1 + 4 + 46 + 2 + 19 + 0 + 592 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 61084531 + ... + 61119629.

It is an arithmetic number, because the mean of its divisors is an integer number (11319091875).

Almost surely, 2^{2144621905920} is an apocalyptic number.

2144621905920 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 2144621905920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4346531280000).

2144621905920 is an abundant number, since it is smaller than the sum of its proper divisors (6548440654080).

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

2144621905920 is a wasteful number, since it uses less digits than its factorization.

2144621905920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35165 (or 35139 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 2144621905920 in words is "two trillion, one hundred forty-four billion, six hundred twenty-one million, nine hundred five thousand, nine hundred twenty".