211221220210101 has 24 divisors (see below), whose sum is σ = 308490657961824. Its totient is φ = 139251361653600.

The previous prime is 211221220210073. The next prime is 211221220210111. The reversal of 211221220210101 is 101012022122112.

211221220210101 is a `hidden beast` number, since 2 + 1 + 1 + 221 + 220 + 210 + 10 + 1 = 666.

It is not a de Polignac number, because 211221220210101 - 2⁵ = 211221220210069 is a prime.

It is a super-2 number, since 2×211221220210101² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221220210111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139735911 + ... + 141239396.

It is an arithmetic number, because the mean of its divisors is an integer number (12853777415076).

Almost surely, 2^{211221220210101} is an apocalyptic number.

It is an amenable number.

211221220210101 is a deficient number, since it is larger than the sum of its proper divisors (97269437751723).

211221220210101 is a wasteful number, since it uses less digits than its factorization.

211221220210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280976241 (or 280976238 counting only the distinct ones).

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

Adding to 211221220210101 its reverse (101012022122112), we get a palindrome (312233242332213).

The spelling of 211221220210101 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred one".