20022221100 has 288 divisors, whose sum is σ = 68593831936. Its totient is φ = 4412620800.

The previous prime is 20022221099. The next prime is 20022221143. The reversal of 20022221100 is 112222002.

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

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 95 ways as a sum of consecutive naturals, for example, 29750364 + ... + 29751036.

Almost surely, 2^20022221100 is an apocalyptic number.

20022221100 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 20022221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34296915968).

20022221100 is an abundant number, since it is smaller than the sum of its proper divisors (48571610836).

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

20022221100 is a wasteful number, since it uses less digits than its factorization.

20022221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185 (or 1178 counting only the distinct ones).

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

Adding to 20022221100 its reverse (112222002), we get a palindrome (20134443102).

The spelling of 20022221100 in words is "twenty billion, twenty-two million, two hundred twenty-one thousand, one hundred".