210000221221221 has 12 divisors (see below), whose sum is σ = 303340190982400. Its totient is φ = 139997129892840.

The previous prime is 210000221221213. The next prime is 210000221221253. The reversal of 210000221221221 is 122122122000012.

It is a happy number.

210000221221221 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 0 + 0 + 221 + 221 + 221 = 666.

It is not a de Polignac number, because 210000221221221 - 2³ = 210000221221213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210000221221194 and 210000221221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000221221291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 251024875 + ... + 251860056.

Almost surely, 2^{210000221221221} is an apocalyptic number.

It is an amenable number.

210000221221221 is a deficient number, since it is larger than the sum of its proper divisors (93339969761179).

210000221221221 is a wasteful number, since it uses less digits than its factorization.

210000221221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502931336 (or 502931333 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210000221221221 its reverse (122122122000012), we get a palindrome (332122343221233).

The spelling of 210000221221221 in words is "two hundred ten trillion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".