1821339413338 has 4 divisors (see below), whose sum is σ = 2732009120010. Its totient is φ = 910669706668.

The previous prime is 1821339413281. The next prime is 1821339413371. The reversal of 1821339413338 is 8333149331281.

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., 1689175900489 + 132163512849 = 1299683^2 + 363543^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1821339413291 and 1821339413300.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455334853333 + ... + 455334853336.

Almost surely, 2^{1821339413338} is an apocalyptic number.

1821339413338 is a deficient number, since it is larger than the sum of its proper divisors (910669706672).

1821339413338 is an equidigital number, since it uses as much as digits as its factorization.

1821339413338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910669706671.

The product of its digits is 1119744, while the sum is 49.

The spelling of 1821339413338 in words is "one trillion, eight hundred twenty-one billion, three hundred thirty-nine million, four hundred thirteen thousand, three hundred thirty-eight".