211221200221221 has 8 divisors (see below), whose sum is σ = 281697684840064. Its totient is φ = 140779424541600.

The previous prime is 211221200221193. The next prime is 211221200221243. The reversal of 211221200221221 is 122122002122112.

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

It is not a de Polignac number, because 211221200221221 - 2²⁵ = 211221166666789 is a prime.

It is a super-2 number, since 2×211221200221221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221200221271) 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, 8677220605 + ... + 8677244946.

It is an arithmetic number, because the mean of its divisors is an integer number (35212210605008).

Almost surely, 2^{211221200221221} is an apocalyptic number.

It is an amenable number.

211221200221221 is a deficient number, since it is larger than the sum of its proper divisors (70476484618843).

211221200221221 is a wasteful number, since it uses less digits than its factorization.

211221200221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17354469611.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211221200221221 its reverse (122122002122112), we get a palindrome (333343202343333).

The spelling of 211221200221221 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred million, two hundred twenty-one thousand, two hundred twenty-one".