21222101022100 has 144 divisors (see below), whose sum is σ = 51815412101376. Its totient is φ = 7478150080000.

The previous prime is 21222101022079. The next prime is 21222101022113. The reversal of 21222101022100 is 122010122212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3189594 + ... + 7253806.

It is an arithmetic number, because the mean of its divisors is an integer number (359829250704).

Almost surely, 2^{21222101022100} is an apocalyptic number.

21222101022100 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 21222101022100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25907706050688).

21222101022100 is an abundant number, since it is smaller than the sum of its proper divisors (30593311079276).

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

21222101022100 is a wasteful number, since it uses less digits than its factorization.

21222101022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064386 (or 4064379 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222101022100 its reverse (122010122212), we get a palindrome (21344111144312).

The spelling of 21222101022100 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred one million, twenty-two thousand, one hundred".