211221211200221 has 8 divisors (see below), whose sum is σ = 214684251069600. Its totient is φ = 207758184139440.

The previous prime is 211221211200161. The next prime is 211221211200299. The reversal of 211221211200221 is 122002112122112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221211200221 is a prime.

It is a super-2 number, since 2×211221211200221² (a number of 29 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 = 211221211200193 and 211221211200202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221211203221) 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, 33462890 + ... + 39270948.

It is an arithmetic number, because the mean of its divisors is an integer number (26835531383700).

Almost surely, 2^{211221211200221} is an apocalyptic number.

It is an amenable number.

211221211200221 is a deficient number, since it is larger than the sum of its proper divisors (3463039869379).

211221211200221 is an equidigital number, since it uses as much as digits as its factorization.

211221211200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6404299.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211221211200221 its reverse (122002112122112), we get a palindrome (333223323322333).

The spelling of 211221211200221 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred thousand, two hundred twenty-one".