21022212111100 has 72 divisors (see below), whose sum is σ = 47193224909040. Its totient is φ = 8118582097920.

The previous prime is 21022212111059. The next prime is 21022212111101. The reversal of 21022212111100 is 111121222012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022212111101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75309987 + ... + 75588613.

It is an arithmetic number, because the mean of its divisors is an integer number (655461457070).

Almost surely, 2^{21022212111100} is an apocalyptic number.

21022212111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022212111100 is an abundant number, since it is smaller than the sum of its proper divisors (26171012797940).

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

21022212111100 is a wasteful number, since it uses less digits than its factorization.

21022212111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304687 (or 304680 counting only the distinct ones).

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

Adding to 21022212111100 its reverse (111121222012), we get a palindrome (21133333333112).

The spelling of 21022212111100 in words is "twenty-one trillion, twenty-two billion, two hundred twelve million, one hundred eleven thousand, one hundred".