1921483728451 has 16 divisors (see below), whose sum is σ = 2225106512640. Its totient is φ = 1625282699040.

The previous prime is 1921483728413. The next prime is 1921483728499. The reversal of 1921483728451 is 1548273841291.

It is not a de Polignac number, because 1921483728451 - 2³³ = 1912893793859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1921483728392 and 1921483728401.

It is not an unprimeable number, because it can be changed into a prime (1921483728751) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5688936 + ... + 6017221.

It is an arithmetic number, because the mean of its divisors is an integer number (139069157040).

Almost surely, 2^{1921483728451} is an apocalyptic number.

1921483728451 is a deficient number, since it is larger than the sum of its proper divisors (303622784189).

1921483728451 is a wasteful number, since it uses less digits than its factorization.

1921483728451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11706474.

The product of its digits is 3870720, while the sum is 55.

The spelling of 1921483728451 in words is "one trillion, nine hundred twenty-one billion, four hundred eighty-three million, seven hundred twenty-eight thousand, four hundred fifty-one".