1821200119394 has 4 divisors (see below), whose sum is σ = 2731800179094. Its totient is φ = 910600059696.

The previous prime is 1821200119373. The next prime is 1821200119471. The reversal of 1821200119394 is 4939110021281.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1212586380625 + 608613738769 = 1101175^2 + 780137^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455300029847 + ... + 455300029850.

Almost surely, 2^{1821200119394} is an apocalyptic number.

1821200119394 is a deficient number, since it is larger than the sum of its proper divisors (910600059700).

1821200119394 is an equidigital number, since it uses as much as digits as its factorization.

1821200119394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910600059699.

The product of its (nonzero) digits is 31104, while the sum is 41.

The spelling of 1821200119394 in words is "one trillion, eight hundred twenty-one billion, two hundred million, one hundred nineteen thousand, three hundred ninety-four".