10221210200021 has 4 divisors (see below), whose sum is σ = 10263621860844. Its totient is φ = 10178798539200.

The previous prime is 10221210199961. The next prime is 10221210200023. The reversal of 10221210200021 is 12000201212201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3863681640625 + 6357528559396 = 1965625^2 + 2521414^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221210200021 - 2²⁶ = 10221143091157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221210199969 and 10221210200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221210200023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21205830050 + ... + 21205830531.

It is an arithmetic number, because the mean of its divisors is an integer number (2565905465211).

Almost surely, 2^{10221210200021} is an apocalyptic number.

It is an amenable number.

10221210200021 is a deficient number, since it is larger than the sum of its proper divisors (42411660823).

10221210200021 is an equidigital number, since it uses as much as digits as its factorization.

10221210200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42411660822.

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

Adding to 10221210200021 its reverse (12000201212201), we get a palindrome (22221411412222).

The spelling of 10221210200021 in words is "ten trillion, two hundred twenty-one billion, two hundred ten million, two hundred thousand, twenty-one".