221001201220221 has 32 divisors (see below), whose sum is σ = 346825203477120. Its totient is φ = 138604759356672.

The previous prime is 221001201220201. The next prime is 221001201220237. The reversal of 221001201220221 is 122022102100122.

It is a happy number.

221001201220221 is a `hidden beast` number, since 2 + 2 + 100 + 120 + 1 + 220 + 221 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-221001201220221 is a prime.

It is a super-2 number, since 2×221001201220221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221001201220194 and 221001201220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001201220201) 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, 107769615 + ... + 109801148.

It is an arithmetic number, because the mean of its divisors is an integer number (10838287608660).

Almost surely, 2^{221001201220221} is an apocalyptic number.

It is an amenable number.

221001201220221 is a deficient number, since it is larger than the sum of its proper divisors (125824002256899).

221001201220221 is a wasteful number, since it uses less digits than its factorization.

221001201220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217573002 (or 217572996 counting only the distinct ones).

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

Adding to 221001201220221 its reverse (122022102100122), we get a palindrome (343023303320343).

The spelling of 221001201220221 in words is "two hundred twenty-one trillion, one billion, two hundred one million, two hundred twenty thousand, two hundred twenty-one".