221021221222101 has 32 divisors (see below), whose sum is σ = 296383427923968. Its totient is φ = 146505333456000.

The previous prime is 221021221222097. The next prime is 221021221222103. The reversal of 221021221222101 is 101222122120122.

It is not a de Polignac number, because 221021221222101 - 2² = 221021221222097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021221222103) 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, 10045038366 + ... + 10045060368.

It is an arithmetic number, because the mean of its divisors is an integer number (9261982122624).

Almost surely, 2^{221021221222101} is an apocalyptic number.

It is an amenable number.

221021221222101 is a deficient number, since it is larger than the sum of its proper divisors (75362206701867).

221021221222101 is a wasteful number, since it uses less digits than its factorization.

221021221222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44841.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221021221222101 its reverse (101222122120122), we get a palindrome (322243343342223).

The spelling of 221021221222101 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred one".