21201022222100 has 108 divisors (see below), whose sum is σ = 54194874431040. Its totient is φ = 7176910104000.

The previous prime is 21201022222099. The next prime is 21201022222109. The reversal of 21201022222100 is 122222010212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022222109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26997326 + ... + 27771525.

It is an arithmetic number, because the mean of its divisors is an integer number (501804392880).

Almost surely, 2^{21201022222100} is an apocalyptic number.

21201022222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201022222100 is an abundant number, since it is smaller than the sum of its proper divisors (32993852208940).

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

21201022222100 is a wasteful number, since it uses less digits than its factorization.

21201022222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54768958 (or 54768944 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21201022222100 its reverse (122222010212), we get a palindrome (21323244232312).

The spelling of 21201022222100 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred twenty-two thousand, one hundred".