212223445578 has 40 divisors (see below), whose sum is σ = 476306181120. Its totient is φ = 70626832200.

The previous prime is 212223445561. The next prime is 212223445583. The reversal of 212223445578 is 875544322212.

212223445578 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 34 + 45 + 578 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 957898 + ... + 1158453.

It is an arithmetic number, because the mean of its divisors is an integer number (11907654528).

Almost surely, 2^212223445578 is an apocalyptic number.

212223445578 is an abundant number, since it is smaller than the sum of its proper divisors (264082735542).

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

212223445578 is a wasteful number, since it uses less digits than its factorization.

212223445578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116984 (or 2116975 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 45.

The spelling of 212223445578 in words is "two hundred twelve billion, two hundred twenty-three million, four hundred forty-five thousand, five hundred seventy-eight".