221021102122221 has 8 divisors (see below), whose sum is σ = 294696644932480. Its totient is φ = 147346480363392.

The previous prime is 221021102122187. The next prime is 221021102122231. The reversal of 221021102122221 is 122221201120122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221021102122221 - 2¹⁵ = 221021102089453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021102122231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229702741 + ... + 230662938.

It is an arithmetic number, because the mean of its divisors is an integer number (36837080616560).

Almost surely, 2^{221021102122221} is an apocalyptic number.

It is an amenable number.

221021102122221 is a deficient number, since it is larger than the sum of its proper divisors (73675542810259).

221021102122221 is a wasteful number, since it uses less digits than its factorization.

221021102122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460525715.

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

Adding to 221021102122221 its reverse (122221201120122), we get a palindrome (343242303242343).

The spelling of 221021102122221 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty-one".