210001201221 has 8 divisors (see below), whose sum is σ = 320001830464. Its totient is φ = 120000686400.

The previous prime is 210001201147. The next prime is 210001201237. The reversal of 210001201221 is 122102100012.

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

It is not a de Polignac number, because 210001201221 - 2²¹ = 209999104069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210001201197 and 210001201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001201261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5000028580 + ... + 5000028621.

It is an arithmetic number, because the mean of its divisors is an integer number (40000228808).

Almost surely, 2^210001201221 is an apocalyptic number.

210001201221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210001201221 is a deficient number, since it is larger than the sum of its proper divisors (110000629243).

210001201221 is a wasteful number, since it uses less digits than its factorization.

210001201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000057211.

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

Adding to 210001201221 its reverse (122102100012), we get a palindrome (332103301233).

It can be divided in two parts, 21000 and 1201221, that added together give a palindrome (1222221).

The spelling of 210001201221 in words is "two hundred ten billion, one million, two hundred one thousand, two hundred twenty-one".