210100021221 has 8 divisors (see below), whose sum is σ = 280136234560. Its totient is φ = 140065244352.

The previous prime is 210100021217. The next prime is 210100021237. The reversal of 210100021221 is 122120001012.

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

It is not a de Polignac number, because 210100021221 - 2² = 210100021217 is a prime.

It is a super-3 number, since 3×210100021221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210100021197 and 210100021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210100021421) 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, 48141 + ... + 650013.

It is an arithmetic number, because the mean of its divisors is an integer number (35017029320).

Almost surely, 2^210100021221 is an apocalyptic number.

It is an amenable number.

210100021221 is a deficient number, since it is larger than the sum of its proper divisors (70036213339).

210100021221 is a wasteful number, since it uses less digits than its factorization.

210100021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718235.

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

Adding to 210100021221 its reverse (122120001012), we get a palindrome (332220022233).

The spelling of 210100021221 in words is "two hundred ten billion, one hundred million, twenty-one thousand, two hundred twenty-one".