211020121120221 has 48 divisors (see below), whose sum is σ = 348810804101760. Its totient is φ = 120423756136320.

The previous prime is 211020121120217. The next prime is 211020121120229. The reversal of 211020121120221 is 122021121020112.

211020121120221 is a `hidden beast` number, since 2 + 1 + 10 + 201 + 211 + 20 + 221 = 666.

It is not a de Polignac number, because 211020121120221 - 2² = 211020121120217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211020121120194 and 211020121120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020121120229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144486966 + ... + 145940136.

It is an arithmetic number, because the mean of its divisors is an integer number (7266891752120).

Almost surely, 2^{211020121120221} is an apocalyptic number.

211020121120221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211020121120221 is a deficient number, since it is larger than the sum of its proper divisors (137790682981539).

211020121120221 is a wasteful number, since it uses less digits than its factorization.

211020121120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456226 (or 1456223 counting only the distinct ones).

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

Adding to 211020121120221 its reverse (122021121020112), we get a palindrome (333041242140333).

The spelling of 211020121120221 in words is "two hundred eleven trillion, twenty billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".