22021211100 has 144 divisors (see below), whose sum is σ = 73017771008. Its totient is φ = 5019528960.

The previous prime is 22021211083. The next prime is 22021211117. The reversal of 22021211100 is 111212022.

It is an interprime number because it is at equal distance from previous prime (22021211083) and next prime (22021211117).

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 (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 756414 + ... + 784986.

Almost surely, 2^22021211100 is an apocalyptic number.

22021211100 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 22021211100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36508885504).

22021211100 is an abundant number, since it is smaller than the sum of its proper divisors (50996559908).

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

22021211100 is a wasteful number, since it uses less digits than its factorization.

22021211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28964 (or 28957 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22021211100 its reverse (111212022), we get a palindrome (22132423122).

The spelling of 22021211100 in words is "twenty-two billion, twenty-one million, two hundred eleven thousand, one hundred".