21012200221100 has 36 divisors (see below), whose sum is σ = 49741608526008. Its totient is φ = 7640800080000.

The previous prime is 21012200221081. The next prime is 21012200221139. The reversal of 21012200221100 is 112200221012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9550999001 + ... + 9551001200.

Almost surely, 2^{21012200221100} is an apocalyptic number.

21012200221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012200221100 is an abundant number, since it is smaller than the sum of its proper divisors (28729408304908).

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

21012200221100 is a wasteful number, since it uses less digits than its factorization.

21012200221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19102000226 (or 19102000219 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012200221100 its reverse (112200221012), we get a palindrome (21124400442112).

The spelling of 21012200221100 in words is "twenty-one trillion, twelve billion, two hundred million, two hundred twenty-one thousand, one hundred".