221021211020121 has 16 divisors (see below), whose sum is σ = 327440957500800. Its totient is φ = 147346517151504.

The previous prime is 221021211020059. The next prime is 221021211020153. The reversal of 221021211020121 is 121020112120122.

221021211020121 is a `hidden beast` number, since 2 + 210 + 21 + 211 + 0 + 201 + 21 = 666.

It is not a de Polignac number, because 221021211020121 - 2¹³ = 221021211011929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221021211020094 and 221021211020103.

It is not an unprimeable number, because it can be changed into a prime (221021211020161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22332426 + ... + 30672131.

It is an arithmetic number, because the mean of its divisors is an integer number (20465059843800).

Almost surely, 2^{221021211020121} is an apocalyptic number.

It is an amenable number.

221021211020121 is a deficient number, since it is larger than the sum of its proper divisors (106419746480679).

221021211020121 is a wasteful number, since it uses less digits than its factorization.

221021211020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53159005 (or 53158999 counting only the distinct ones).

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

Adding to 221021211020121 its reverse (121020112120122), we get a palindrome (342041323140243).

The spelling of 221021211020121 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, twenty thousand, one hundred twenty-one".