10221202022121 has 24 divisors (see below), whose sum is σ = 14912559849096. Its totient is φ = 6745571366400.

The previous prime is 10221202022113. The next prime is 10221202022123. The reversal of 10221202022121 is 12122020212201.

It is a happy number.

10221202022121 is a `hidden beast` number, since 1 + 0 + 221 + 202 + 0 + 221 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 589731843600 + 9631470178521 = 767940^2 + 3103461^2 .

It is not a de Polignac number, because 10221202022121 - 2³ = 10221202022113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10221202022094 and 10221202022103.

It is not an unprimeable number, because it can be changed into a prime (10221202022123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4700481 + ... + 6522033.

It is an arithmetic number, because the mean of its divisors is an integer number (621356660379).

Almost surely, 2^{10221202022121} is an apocalyptic number.

It is an amenable number.

10221202022121 is a deficient number, since it is larger than the sum of its proper divisors (4691357826975).

10221202022121 is a wasteful number, since it uses less digits than its factorization.

10221202022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827833 (or 1827830 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 10221202022121 its reverse (12122020212201), we get a palindrome (22343222234322).

The spelling of 10221202022121 in words is "ten trillion, two hundred twenty-one billion, two hundred two million, twenty-two thousand, one hundred twenty-one".