210000211221 has 8 divisors (see below), whose sum is σ = 280004210560. Its totient is φ = 139998176352.

The previous prime is 210000211181. The next prime is 210000211229. The reversal of 210000211221 is 122112000012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 210000211221 - 2⁷ = 210000211093 is a prime.

It is a super-2 number, since 2×210000211221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210000211197 and 210000211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000211229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220360 + ... + 684513.

It is an arithmetic number, because the mean of its divisors is an integer number (35000526320).

Almost surely, 2^210000211221 is an apocalyptic number.

It is an amenable number.

210000211221 is a deficient number, since it is larger than the sum of its proper divisors (70003999339).

210000211221 is an equidigital number, since it uses as much as digits as its factorization.

210000211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982235.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210000211221 its reverse (122112000012), we get a palindrome (332112211233).

The spelling of 210000211221 in words is "two hundred ten billion, two hundred eleven thousand, two hundred twenty-one".