1921483728450 has 576 divisors, whose sum is σ = 6405778753920. Its totient is φ = 405969408000.

The previous prime is 1921483728413. The next prime is 1921483728499. The reversal of 1921483728450 is 548273841291.

1921483728450 is a `hidden beast` number, since 1 + 9 + 2 + 148 + 372 + 84 + 50 = 666.

It is a super-2 number, since 2×1921483728450² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 382686940 + ... + 382691960.

It is an arithmetic number, because the mean of its divisors is an integer number (11121143670).

Almost surely, 2^{1921483728450} is an apocalyptic number.

1921483728450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921483728450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3202889376960).

1921483728450 is an abundant number, since it is smaller than the sum of its proper divisors (4484295025470).

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

1921483728450 is a wasteful number, since it uses less digits than its factorization.

1921483728450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395 (or 5387 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 1921483728450 in words is "one trillion, nine hundred twenty-one billion, four hundred eighty-three million, seven hundred twenty-eight thousand, four hundred fifty".