221021200000001 has 8 divisors (see below), whose sum is σ = 221435193744000. Its totient is φ = 220607356290880.

The previous prime is 221021199999989. The next prime is 221021200000021. The reversal of 221021200000001 is 100000002120122.

It is a happy number.

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 221021200000001 - 2³⁰ = 221020126258177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021200000021) 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, 34559480 + ... + 40452441.

It is an arithmetic number, because the mean of its divisors is an integer number (27679399218000).

Almost surely, 2^{221021200000001} is an apocalyptic number.

It is an amenable number.

221021200000001 is a deficient number, since it is larger than the sum of its proper divisors (413993743999).

221021200000001 is an equidigital number, since it uses as much as digits as its factorization.

221021200000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75017439.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221021200000001 its reverse (100000002120122), we get a palindrome (321021202120123).

The spelling of 221021200000001 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred million, one", and thus it is an aban number.