1821263273916 has 24 divisors (see below), whose sum is σ = 4249636930560. Its totient is φ = 607084525872.

The previous prime is 1821263273887. The next prime is 1821263273923. The reversal of 1821263273916 is 6193723621281.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3308325 + ... + 3819363.

It is an arithmetic number, because the mean of its divisors is an integer number (177068205440).

Almost surely, 2^{1821263273916} is an apocalyptic number.

It is an amenable number.

1821263273916 is an abundant number, since it is smaller than the sum of its proper divisors (2428373656644).

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

1821263273916 is a wasteful number, since it uses less digits than its factorization.

1821263273916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808033 (or 808031 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The spelling of 1821263273916 in words is "one trillion, eight hundred twenty-one billion, two hundred sixty-three million, two hundred seventy-three thousand, nine hundred sixteen".