211220001121221 has 12 divisors (see below), whose sum is σ = 305096834614572. Its totient is φ = 140812744493376.

The previous prime is 211220001121159. The next prime is 211220001121231. The reversal of 211220001121221 is 122121100022112.

211220001121221 is a `hidden beast` number, since 211 + 2 + 200 + 0 + 11 + 21 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 90472627124100 + 120747373997121 = 9511710^2 + 10988511^2 .

It is not a de Polignac number, because 211220001121221 - 2¹³ = 211220001113029 is a prime.

It is a super-2 number, since 2×211220001121221² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211220001121194 and 211220001121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220001121231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46857826 + ... + 51167331.

It is an arithmetic number, because the mean of its divisors is an integer number (25424736217881).

Almost surely, 2^{211220001121221} is an apocalyptic number.

It is an amenable number.

211220001121221 is a deficient number, since it is larger than the sum of its proper divisors (93876833493351).

211220001121221 is a wasteful number, since it uses less digits than its factorization.

211220001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98264580 (or 98264577 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211220001121221 its reverse (122121100022112), we get a palindrome (333341101143333).

The spelling of 211220001121221 in words is "two hundred eleven trillion, two hundred twenty billion, one million, one hundred twenty-one thousand, two hundred twenty-one".