22120021200 has 120 divisors (see below), whose sum is σ = 71485299648. Its totient is φ = 5846435840.

The previous prime is 22120021199. The next prime is 22120021243. The reversal of 22120021200 is 212002122.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54037 + ... + 217163.

Almost surely, 2^22120021200 is an apocalyptic number.

22120021200 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 22120021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35742649824).

22120021200 is an abundant number, since it is smaller than the sum of its proper divisors (49365278448).

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

22120021200 is a wasteful number, since it uses less digits than its factorization.

22120021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163261 (or 163250 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22120021200 its reverse (212002122), we get a palindrome (22332023322).

The spelling of 22120021200 in words is "twenty-two billion, one hundred twenty million, twenty-one thousand, two hundred".