21221020212201 has 16 divisors (see below), whose sum is σ = 31462938388800. Its totient is φ = 14136371341344.

The previous prime is 21221020212127. The next prime is 21221020212277. The reversal of 21221020212201 is 10221202012212.

It is a happy number.

21221020212201 is a `hidden beast` number, since 21 + 2 + 210 + 20 + 212 + 201 = 666.

It is not a de Polignac number, because 21221020212201 - 2¹⁰ = 21221020211177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221020212281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304838631 + ... + 304908236.

It is an arithmetic number, because the mean of its divisors is an integer number (1966433649300).

Almost surely, 2^{21221020212201} is an apocalyptic number.

It is an amenable number.

21221020212201 is a deficient number, since it is larger than the sum of its proper divisors (10241918176599).

21221020212201 is a wasteful number, since it uses less digits than its factorization.

21221020212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609748165 (or 609748159 counting only the distinct ones).

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

Adding to 21221020212201 its reverse (10221202012212), we get a palindrome (31442222224413).

The spelling of 21221020212201 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred twelve thousand, two hundred one".