221021221011001 has 8 divisors (see below), whose sum is σ = 223300028314944. Its totient is φ = 218744187793200.

The previous prime is 221021221010963. The next prime is 221021221011013. The reversal of 221021221011001 is 100110122120122.

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

It is a cyclic number.

It is not a de Polignac number, because 221021221011001 - 2¹³ = 221021221002809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021221011061) 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, 443271085 + ... + 443769418.

It is an arithmetic number, because the mean of its divisors is an integer number (27912503539368).

Almost surely, 2^{221021221011001} is an apocalyptic number.

It is an amenable number.

221021221011001 is a deficient number, since it is larger than the sum of its proper divisors (2278807303943).

221021221011001 is a wasteful number, since it uses less digits than its factorization.

221021221011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887043071.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221021221011001 its reverse (100110122120122), we get a palindrome (321131343131123).

The spelling of 221021221011001 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, eleven thousand, one".