21012100212200 has 24 divisors (see below), whose sum is σ = 48853132993830. Its totient is φ = 8404840084800.

The previous prime is 21012100212197. The next prime is 21012100212209. The reversal of 21012100212200 is 221200121012.

It can be written as a sum of positive squares in 3 ways, for example, as 12537562068964 + 8474538143236 = 3540842^2 + 2911106^2 .

It is not an unprimeable number, because it can be changed into a prime (21012100212209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52530250331 + ... + 52530250730.

Almost surely, 2^{21012100212200} is an apocalyptic number.

21012100212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012100212200 is an abundant number, since it is smaller than the sum of its proper divisors (27841032781630).

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

21012100212200 is a wasteful number, since it uses less digits than its factorization.

21012100212200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105060501077 (or 105060501068 counting only the distinct ones).

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

Adding to 21012100212200 its reverse (221200121012), we get a palindrome (21233300333212).

The spelling of 21012100212200 in words is "twenty-one trillion, twelve billion, one hundred million, two hundred twelve thousand, two hundred".