21210322200021 has 6 divisors (see below), whose sum is σ = 30637132066710. Its totient is φ = 14140214800008.

The previous prime is 21210322200017. The next prime is 21210322200037. The reversal of 21210322200021 is 12000222301212.

21210322200021 is a `hidden beast` number, since 2 + 121 + 0 + 322 + 200 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21210307866225 + 14333796 = 4605465^2 + 3786^2 .

It is not a de Polignac number, because 21210322200021 - 2² = 21210322200017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210322199967 and 21210322200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210322205021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178351233326 + ... + 1178351233343.

It is an arithmetic number, because the mean of its divisors is an integer number (5106188677785).

Almost surely, 2^{21210322200021} is an apocalyptic number.

It is an amenable number.

21210322200021 is a deficient number, since it is larger than the sum of its proper divisors (9426809866689).

21210322200021 is a wasteful number, since it uses less digits than its factorization.

21210322200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356702466675 (or 2356702466672 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21210322200021 its reverse (12000222301212), we get a palindrome (33210544501233).

The spelling of 21210322200021 in words is "twenty-one trillion, two hundred ten billion, three hundred twenty-two million, two hundred thousand, twenty-one".