210221201005 has 4 divisors (see below), whose sum is σ = 252265441212. Its totient is φ = 168176960800.

The previous prime is 210221200963. The next prime is 210221201027. The reversal of 210221201005 is 500102122012.

It is a happy number.

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 142553063844 + 67668137161 = 377562^2 + 260131^2 .

It is not a de Polignac number, because 210221201005 - 2⁷ = 210221200877 is a prime.

It is a super-2 number, since 2×210221201005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210221201005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21022120096 + ... + 21022120105.

It is an arithmetic number, because the mean of its divisors is an integer number (63066360303).

Almost surely, 2^210221201005 is an apocalyptic number.

It is an amenable number.

210221201005 is a deficient number, since it is larger than the sum of its proper divisors (42044240207).

210221201005 is an equidigital number, since it uses as much as digits as its factorization.

210221201005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42044240206.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 210221201005 its reverse (500102122012), we get a palindrome (710323323017).

The spelling of 210221201005 in words is "two hundred ten billion, two hundred twenty-one million, two hundred one thousand, five".