212355816220 has 24 divisors (see below), whose sum is σ = 460332609408. Its totient is φ = 82202251200.

The previous prime is 212355816203. The next prime is 212355816221. The reversal of 212355816220 is 22618553212.

It is a self number, because there is not a number n which added to its sum of digits gives 212355816220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212355816221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171254071 + ... + 171255310.

It is an arithmetic number, because the mean of its divisors is an integer number (19180525392).

Almost surely, 2^212355816220 is an apocalyptic number.

212355816220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212355816220 is an abundant number, since it is smaller than the sum of its proper divisors (247976793188).

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

212355816220 is a wasteful number, since it uses less digits than its factorization.

212355816220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342509421 (or 342509419 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 212355816220 in words is "two hundred twelve billion, three hundred fifty-five million, eight hundred sixteen thousand, two hundred twenty".