21203322312100 has 72 divisors (see below), whose sum is σ = 47522734628096. Its totient is φ = 8203021200000.

The previous prime is 21203322312091. The next prime is 21203322312103. The reversal of 21203322312100 is 121322330212.

It is not an unprimeable number, because it can be changed into a prime (21203322312103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3432775 + ... + 7361425.

Almost surely, 2^{21203322312100} is an apocalyptic number.

21203322312100 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 21203322312100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23761367314048).

21203322312100 is an abundant number, since it is smaller than the sum of its proper divisors (26319412315996).

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

21203322312100 is a wasteful number, since it uses less digits than its factorization.

21203322312100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3930437 (or 3930430 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21203322312100 its reverse (121322330212), we get a palindrome (21324644642312).

The spelling of 21203322312100 in words is "twenty-one trillion, two hundred three billion, three hundred twenty-two million, three hundred twelve thousand, one hundred".