22221012122100 has 216 divisors, whose sum is σ = 76146518727552. Its totient is φ = 5375276121600.

The previous prime is 22221012122039. The next prime is 22221012122129. The reversal of 22221012122100 is 122121012222.

It is a happy number.

22221012122100 is a `hidden beast` number, since 22 + 221 + 0 + 1 + 212 + 210 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2159784 + ... + 7007616.

Almost surely, 2^{22221012122100} is an apocalyptic number.

22221012122100 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 22221012122100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38073259363776).

22221012122100 is an abundant number, since it is smaller than the sum of its proper divisors (53925506605452).

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

22221012122100 is a wasteful number, since it uses less digits than its factorization.

22221012122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4848327 (or 4848317 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22221012122100 its reverse (122121012222), we get a palindrome (22343133134322).

It can be divided in two parts, 22221012122 and 100, that added together give a palindrome (22221012222).

The spelling of 22221012122100 in words is "twenty-two trillion, two hundred twenty-one billion, twelve million, one hundred twenty-two thousand, one hundred".