1619796894421 has 4 divisors (see below), whose sum is σ = 1619800933644. Its totient is φ = 1619792855200.

The previous prime is 1619796894371. The next prime is 1619796894467. The reversal of 1619796894421 is 1244986979161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 814136267025 + 805660627396 = 902295^2 + 897586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1619796894421 - 2²⁷ = 1619662676693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1619796894491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1342390 + ... + 2245351.

It is an arithmetic number, because the mean of its divisors is an integer number (404950233411).

Almost surely, 2^{1619796894421} is an apocalyptic number.

It is an amenable number.

1619796894421 is a deficient number, since it is larger than the sum of its proper divisors (4039223).

1619796894421 is an equidigital number, since it uses as much as digits as its factorization.

1619796894421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039222.

The product of its digits is 47029248, while the sum is 67.

The spelling of 1619796894421 in words is "one trillion, six hundred nineteen billion, seven hundred ninety-six million, eight hundred ninety-four thousand, four hundred twenty-one".