21130121112100 has 216 divisors, whose sum is σ = 62030408869184. Its totient is φ = 6079395168000.

The previous prime is 21130121112059. The next prime is 21130121112109. The reversal of 21130121112100 is 121112103112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21130121112109) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8493906 + ... + 10696105.

Almost surely, 2^{21130121112100} is an apocalyptic number.

21130121112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130121112100 is an abundant number, since it is smaller than the sum of its proper divisors (40900287757084).

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

21130121112100 is a wasteful number, since it uses less digits than its factorization.

21130121112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19190067 (or 19190049 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21130121112100 its reverse (121112103112), we get a palindrome (21251233215212).

The spelling of 21130121112100 in words is "twenty-one trillion, one hundred thirty billion, one hundred twenty-one million, one hundred twelve thousand, one hundred".