21210221212200 has 96 divisors (see below), whose sum is σ = 73057428638400. Its totient is φ = 5656058988480.

The previous prime is 21210221212163. The next prime is 21210221212211. The reversal of 21210221212200 is 221212201212.

It is a happy number.

21210221212200 is a `hidden beast` number, since 2 + 1 + 210 + 221 + 212 + 20 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1963903972 + ... + 1963914771.

It is an arithmetic number, because the mean of its divisors is an integer number (761014881650).

Almost surely, 2^{21210221212200} is an apocalyptic number.

21210221212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210221212200 is an abundant number, since it is smaller than the sum of its proper divisors (51847207426200).

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

21210221212200 is a wasteful number, since it uses less digits than its factorization.

21210221212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3927818768 (or 3927818753 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210221212200 its reverse (221212201212), we get a palindrome (21431433413412).

The spelling of 21210221212200 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, two hundred".