210221200220210 has 64 divisors (see below), whose sum is σ = 406198801728864. Its totient is φ = 78047682969600.

The previous prime is 210221200220189. The next prime is 210221200220281. The reversal of 210221200220210 is 12022002122012.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 63970707352561 + 146250492867649 = 7998169^2 + 12093407^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93465230 + ... + 95687990.

Almost surely, 2^{210221200220210} is an apocalyptic number.

210221200220210 is a deficient number, since it is larger than the sum of its proper divisors (195977601508654).

210221200220210 is a wasteful number, since it uses less digits than its factorization.

210221200220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230479.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 210221200220210 its reverse (12022002122012), we get a palindrome (222243202342222).

The spelling of 210221200220210 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred million, two hundred twenty thousand, two hundred ten".