212220021111100 has 72 divisors (see below), whose sum is σ = 463362792046448. Its totient is φ = 84363565824000.

The previous prime is 212220021111083. The next prime is 212220021111169. The reversal of 212220021111100 is 1111120022212.

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 23 ways as a sum of consecutive naturals, for example, 392510950 + ... + 393051250.

Almost surely, 2^{212220021111100} is an apocalyptic number.

212220021111100 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 212220021111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231681396023224).

212220021111100 is an abundant number, since it is smaller than the sum of its proper divisors (251142770935348).

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

212220021111100 is a wasteful number, since it uses less digits than its factorization.

212220021111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564575 (or 564568 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212220021111100 its reverse (1111120022212), we get a palindrome (213331141133312).

The spelling of 212220021111100 in words is "two hundred twelve trillion, two hundred twenty billion, twenty-one million, one hundred eleven thousand, one hundred".