210000010221 has 24 divisors (see below), whose sum is σ = 316565248896. Its totient is φ = 133894648800.

The previous prime is 210000010189. The next prime is 210000010271. The reversal of 210000010221 is 122010000012.

It is not a de Polignac number, because 210000010221 - 2⁵ = 210000010189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000010271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1528671 + ... + 1660371.

It is an arithmetic number, because the mean of its divisors is an integer number (13190218704).

Almost surely, 2^210000010221 is an apocalyptic number.

It is an amenable number.

210000010221 is a deficient number, since it is larger than the sum of its proper divisors (106565238675).

210000010221 is a wasteful number, since it uses less digits than its factorization.

210000010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139433 (or 139430 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210000010221 its reverse (122010000012), we get a palindrome (332010010233).

The spelling of 210000010221 in words is "two hundred ten billion, ten thousand, two hundred twenty-one".