211221121021201 has 8 divisors (see below), whose sum is σ = 229510216390400. Its totient is φ = 193649245078320.

The previous prime is 211221121021189. The next prime is 211221121021213. The reversal of 211221121021201 is 102120121122112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (211221121021189) and next prime (211221121021213).

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

It is a cyclic number.

It is not a de Polignac number, because 211221121021201 - 2²⁷ = 211220986803473 is a prime.

It is a super-2 number, since 2×211221121021201² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221121027201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179304855966 + ... + 179304857143.

It is an arithmetic number, because the mean of its divisors is an integer number (28688777048800).

Almost surely, 2^{211221121021201} is an apocalyptic number.

It is an amenable number.

211221121021201 is a deficient number, since it is larger than the sum of its proper divisors (18289095369199).

211221121021201 is a wasteful number, since it uses less digits than its factorization.

211221121021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358609713159.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221121021201 its reverse (102120121122112), we get a palindrome (313341242143313).

The spelling of 211221121021201 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, two hundred one".