21332432121100 has 36 divisors (see below), whose sum is σ = 49014399924504. Its totient is φ = 8031033268480.

The previous prime is 21332432121079. The next prime is 21332432121103. The reversal of 21332432121100 is 112123423312.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21332432121103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6274243042 + ... + 6274246441.

It is an arithmetic number, because the mean of its divisors is an integer number (1361511109014).

Almost surely, 2^{21332432121100} is an apocalyptic number.

21332432121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21332432121100 is an abundant number, since it is smaller than the sum of its proper divisors (27681967803404).

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

21332432121100 is a wasteful number, since it uses less digits than its factorization.

21332432121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12548489514 (or 12548489507 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21332432121100 its reverse (112123423312), we get a palindrome (21444555544412).

The spelling of 21332432121100 in words is "twenty-one trillion, three hundred thirty-two billion, four hundred thirty-two million, one hundred twenty-one thousand, one hundred".