212111202221220 has 192 divisors, whose sum is σ = 605181858817536. Its totient is φ = 55497749852160.

The previous prime is 212111202221143. The next prime is 212111202221291. The reversal of 212111202221220 is 22122202111212.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11145553105 + ... + 11145572135.

It is an arithmetic number, because the mean of its divisors is an integer number (3151988848008).

Almost surely, 2^{212111202221220} is an apocalyptic number.

212111202221220 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 212111202221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302590929408768).

212111202221220 is an abundant number, since it is smaller than the sum of its proper divisors (393070656596316).

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

212111202221220 is a wasteful number, since it uses less digits than its factorization.

212111202221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32230 (or 32228 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212111202221220 its reverse (22122202111212), we get a palindrome (234233404332432).

The spelling of 212111202221220 in words is "two hundred twelve trillion, one hundred eleven billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty".