212457056444380 has 96 divisors (see below), whose sum is σ = 488476029565440. Its totient is φ = 76978447860480.

The previous prime is 212457056444333. The next prime is 212457056444441. The reversal of 212457056444380 is 83444650754212.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333520137 + ... + 334156543.

It is an arithmetic number, because the mean of its divisors is an integer number (5088291974640).

Almost surely, 2^{212457056444380} is an apocalyptic number.

212457056444380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212457056444380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244238014782720).

212457056444380 is an abundant number, since it is smaller than the sum of its proper divisors (276018973121060).

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

212457056444380 is a wasteful number, since it uses less digits than its factorization.

212457056444380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641899 (or 641897 counting only the distinct ones).

The product of its (nonzero) digits is 25804800, while the sum is 55.

The spelling of 212457056444380 in words is "two hundred twelve trillion, four hundred fifty-seven billion, fifty-six million, four hundred forty-four thousand, three hundred eighty".