211210220221221 has 8 divisors (see below), whose sum is σ = 303276213651040. Its totient is φ = 129975520136112.

The previous prime is 211210220221157. The next prime is 211210220221237. The reversal of 211210220221221 is 122122022012112.

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

It is not a de Polignac number, because 211210220221221 - 2⁶ = 211210220221157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210220271221) 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, 2707823336131 + ... + 2707823336208.

It is an arithmetic number, because the mean of its divisors is an integer number (37909526706380).

Almost surely, 2^{211210220221221} is an apocalyptic number.

It is an amenable number.

211210220221221 is a deficient number, since it is larger than the sum of its proper divisors (92065993429819).

211210220221221 is a wasteful number, since it uses less digits than its factorization.

211210220221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415646672355.

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

Adding to 211210220221221 its reverse (122122022012112), we get a palindrome (333332242233333).

The spelling of 211210220221221 in words is "two hundred eleven trillion, two hundred ten billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".