21080136100 has 27 divisors (see below), whose sum is σ = 45747046177. Its totient is φ = 8431473680.

The previous prime is 21080136097. The next prime is 21080136107. The reversal of 21080136100 is 163108012.

The square root of 21080136100 is 145190.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7588848996 + 13491287104 = 87114^2 + 116152^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21080136107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1444641 + ... + 1459159.

Almost surely, 2^21080136100 is an apocalyptic number.

21080136100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

21080136100 is the 145190-th square number.

It is an amenable number.

21080136100 is an abundant number, since it is smaller than the sum of its proper divisors (24666910077).

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

21080136100 is an frugal number, since it uses more digits than its factorization.

21080136100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29052 (or 14526 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21080136100 in words is "twenty-one billion, eighty million, one hundred thirty-six thousand, one hundred".