21120221210121 has 48 divisors (see below), whose sum is σ = 34936178135040. Its totient is φ = 12177273420000.

The previous prime is 21120221210111. The next prime is 21120221210161. The reversal of 21120221210121 is 12101212202112.

21120221210121 is a `hidden beast` number, since 2 + 112 + 0 + 221 + 210 + 121 = 666.

It is not a de Polignac number, because 21120221210121 - 2⁹ = 21120221209609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120221210094 and 21120221210103.

It is not an unprimeable number, because it can be changed into a prime (21120221210111) 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, 58139205 + ... + 58501346.

It is an arithmetic number, because the mean of its divisors is an integer number (727837044480).

Almost surely, 2^{21120221210121} is an apocalyptic number.

It is an amenable number.

21120221210121 is a deficient number, since it is larger than the sum of its proper divisors (13815956924919).

21120221210121 is a wasteful number, since it uses less digits than its factorization.

21120221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116640658 (or 116640655 counting only the distinct ones).

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

Adding to 21120221210121 its reverse (12101212202112), we get a palindrome (33221433412233).

The spelling of 21120221210121 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".