22001221100100 has 144 divisors (see below), whose sum is σ = 71320715557056. Its totient is φ = 5189477184000.

The previous prime is 22001221100099. The next prime is 22001221100113. The reversal of 22001221100100 is 100112210022.

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

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, 89972991 + ... + 90217190.

It is an arithmetic number, because the mean of its divisors is an integer number (495282746924).

Almost surely, 2^{22001221100100} is an apocalyptic number.

22001221100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001221100100 is an abundant number, since it is smaller than the sum of its proper divisors (49319494456956).

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

22001221100100 is a wasteful number, since it uses less digits than its factorization.

22001221100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180190246 (or 180190239 counting only the distinct ones).

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

Adding to 22001221100100 its reverse (100112210022), we get a palindrome (22101333310122).

The spelling of 22001221100100 in words is "twenty-two trillion, one billion, two hundred twenty-one million, one hundred thousand, one hundred".