212445445404 has 48 divisors (see below), whose sum is σ = 511811987456. Its totient is φ = 68515329600.

The previous prime is 212445445397. The next prime is 212445445409. The reversal of 212445445404 is 404544544212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212445445409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1647969 + ... + 1772199.

Almost surely, 2^212445445404 is an apocalyptic number.

It is an amenable number.

212445445404 is an abundant number, since it is smaller than the sum of its proper divisors (299366542052).

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

212445445404 is a wasteful number, since it uses less digits than its factorization.

212445445404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128866 (or 128864 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 39.

Adding to 212445445404 its reverse (404544544212), we get a palindrome (616989989616).

The spelling of 212445445404 in words is "two hundred twelve billion, four hundred forty-five million, four hundred forty-five thousand, four hundred four".