210000000221 has 4 divisors (see below), whose sum is σ = 229090909344. Its totient is φ = 190909091100.

The previous prime is 210000000209. The next prime is 210000000227. The reversal of 210000000221 is 122000000012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210000000221 - 2²² = 209995805917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210000000199 and 210000000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000000227) 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, 9545454545 + ... + 9545454566.

It is an arithmetic number, because the mean of its divisors is an integer number (57272727336).

Almost surely, 2^210000000221 is an apocalyptic number.

It is an amenable number.

210000000221 is a deficient number, since it is larger than the sum of its proper divisors (19090909123).

210000000221 is a wasteful number, since it uses less digits than its factorization.

210000000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19090909122.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 210000000221 its reverse (122000000012), we get a palindrome (332000000233).

The spelling of 210000000221 in words is "two hundred ten billion, two hundred twenty-one", and thus it is an aban number.