221221012001 has 8 divisors (see below), whose sum is σ = 241368367104. Its totient is φ = 201079715920.

The previous prime is 221221011989. The next prime is 221221012007. The reversal of 221221012001 is 100210122122.

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 221221012001 - 2⁶ = 221221011937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221012007) 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, 1438241 + ... + 1584606.

It is an arithmetic number, because the mean of its divisors is an integer number (30171045888).

Almost surely, 2^221221012001 is an apocalyptic number.

It is an amenable number.

221221012001 is a deficient number, since it is larger than the sum of its proper divisors (20147355103).

221221012001 is a wasteful number, since it uses less digits than its factorization.

221221012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029511.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221221012001 its reverse (100210122122), we get a palindrome (321431134123).

The spelling of 221221012001 in words is "two hundred twenty-one billion, two hundred twenty-one million, twelve thousand, one".