21443512312100 has 18 divisors (see below), whose sum is σ = 46532421717474. Its totient is φ = 8577404924800.

The previous prime is 21443512312099. The next prime is 21443512312109. The reversal of 21443512312100 is 121321534412.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1400681718016 + 20042830594084 = 1183504^2 + 4476922^2 .

It is not an unprimeable number, because it can be changed into a prime (21443512312109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107217561461 + ... + 107217561660.

Almost surely, 2^{21443512312100} is an apocalyptic number.

21443512312100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443512312100 is an abundant number, since it is smaller than the sum of its proper divisors (25088909405374).

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

21443512312100 is a wasteful number, since it uses less digits than its factorization.

21443512312100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214435123135 (or 214435123128 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21443512312100 its reverse (121321534412), we get a palindrome (21564833846512).

The spelling of 21443512312100 in words is "twenty-one trillion, four hundred forty-three billion, five hundred twelve million, three hundred twelve thousand, one hundred".