221021101212201 has 40 divisors (see below), whose sum is σ = 332034063064704. Its totient is φ = 146514519649440.

The previous prime is 221021101212187. The next prime is 221021101212299. The reversal of 221021101212201 is 102212101120122.

221021101212201 is a `hidden beast` number, since 2 + 210 + 2 + 110 + 121 + 220 + 1 = 666.

It is not a de Polignac number, because 221021101212201 - 2¹⁰ = 221021101211177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221021101212001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 113729470 + ... + 115656536.

Almost surely, 2^{221021101212201} is an apocalyptic number.

It is an amenable number.

221021101212201 is a deficient number, since it is larger than the sum of its proper divisors (111012961852503).

221021101212201 is a wasteful number, since it uses less digits than its factorization.

221021101212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935083 (or 1935074 counting only the distinct ones).

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

Adding to 221021101212201 its reverse (102212101120122), we get a palindrome (323233202332323).

The spelling of 221021101212201 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred one million, two hundred twelve thousand, two hundred one".