1815882446021 has 12 divisors (see below), whose sum is σ = 2112447597120. Its totient is φ = 1556401001400.

The previous prime is 1815882446017. The next prime is 1815882446047. The reversal of 1815882446021 is 1206442885181.

It is not a de Polignac number, because 1815882446021 - 2² = 1815882446017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1815882446321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 291860 + ... + 1927938.

It is an arithmetic number, because the mean of its divisors is an integer number (176037299760).

Almost surely, 2^{1815882446021} is an apocalyptic number.

It is an amenable number.

1815882446021 is a deficient number, since it is larger than the sum of its proper divisors (296565151099).

1815882446021 is a wasteful number, since it uses less digits than its factorization.

1815882446021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658744 (or 1658737 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 50.

The spelling of 1815882446021 in words is "one trillion, eight hundred fifteen billion, eight hundred eighty-two million, four hundred forty-six thousand, twenty-one".