221101021221 has 8 divisors (see below), whose sum is σ = 297122632704. Its totient is φ = 146240045280.

The previous prime is 221101021177. The next prime is 221101021277. The reversal of 221101021221 is 122120101122.

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

It is a de Polignac number, because none of the positive numbers 2^k-221101021221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221101021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101021291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290158440 + ... + 290159201.

It is an arithmetic number, because the mean of its divisors is an integer number (37140329088).

Almost surely, 2^221101021221 is an apocalyptic number.

It is an amenable number.

221101021221 is a deficient number, since it is larger than the sum of its proper divisors (76021611483).

221101021221 is a wasteful number, since it uses less digits than its factorization.

221101021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580317771.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221101021221 its reverse (122120101122), we get a palindrome (343221122343).

The spelling of 221101021221 in words is "two hundred twenty-one billion, one hundred one million, twenty-one thousand, two hundred twenty-one".