21102221210121 has 32 divisors (see below), whose sum is σ = 32411336563200. Its totient is φ = 13553316524160.

The previous prime is 21102221210101. The next prime is 21102221210197. The reversal of 21102221210121 is 12101212220112.

21102221210121 is a `hidden beast` number, since 2 + 110 + 2 + 221 + 210 + 121 = 666.

It is not a de Polignac number, because 21102221210121 - 2²⁶ = 21102154101257 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21102221210094 and 21102221210103.

It is not an unprimeable number, because it can be changed into a prime (21102221210101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29128465 + ... + 29844126.

It is an arithmetic number, because the mean of its divisors is an integer number (1012854267600).

Almost surely, 2^{21102221210121} is an apocalyptic number.

It is an amenable number.

21102221210121 is a deficient number, since it is larger than the sum of its proper divisors (11309115353079).

21102221210121 is a wasteful number, since it uses less digits than its factorization.

21102221210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58973086 (or 58973080 counting only the distinct ones).

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

Adding to 21102221210121 its reverse (12101212220112), we get a palindrome (33203433430233).

The spelling of 21102221210121 in words is "twenty-one trillion, one hundred two billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".