20821443678312 has 64 divisors (see below), whose sum is σ = 52086326443200. Its totient is φ = 6936119646720.

The previous prime is 20821443678293. The next prime is 20821443678341. The reversal of 20821443678312 is 21387634412802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 926663014 + ... + 926685482.

It is an arithmetic number, because the mean of its divisors is an integer number (813848850675).

Almost surely, 2^{20821443678312} is an apocalyptic number.

It is an amenable number.

20821443678312 is an abundant number, since it is smaller than the sum of its proper divisors (31264882764888).

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

20821443678312 is a wasteful number, since it uses less digits than its factorization.

20821443678312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45026 (or 45022 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 20821443678312 in words is "twenty trillion, eight hundred twenty-one billion, four hundred forty-three million, six hundred seventy-eight thousand, three hundred twelve".