211220101212221 has 16 divisors (see below), whose sum is σ = 231812216568576. Its totient is φ = 191661734516736.

The previous prime is 211220101212163. The next prime is 211220101212299. The reversal of 211220101212221 is 122212101022112.

It is a cyclic number.

It is not a de Polignac number, because 211220101212221 - 2³⁰ = 211219027470397 is a prime.

It is a super-2 number, since 2×211220101212221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220101212193 and 211220101212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220101211221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1972749236 + ... + 1972856301.

It is an arithmetic number, because the mean of its divisors is an integer number (14488263535536).

Almost surely, 2^{211220101212221} is an apocalyptic number.

It is an amenable number.

211220101212221 is a deficient number, since it is larger than the sum of its proper divisors (20592115356355).

211220101212221 is a wasteful number, since it uses less digits than its factorization.

211220101212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3945605668.

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

Adding to 211220101212221 its reverse (122212101022112), we get a palindrome (333432202234333).

The spelling of 211220101212221 in words is "two hundred eleven trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, two hundred twenty-one".