221212100010001 has 8 divisors (see below), whose sum is σ = 228349336565504. Its totient is φ = 214074948602160.

The previous prime is 221212100009969. The next prime is 221212100010007. The reversal of 221212100010001 is 100010001212122.

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 221212100010001 - 2⁵ = 221212100009969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212100010007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15986175 + ... + 26419348.

It is an arithmetic number, because the mean of its divisors is an integer number (28543667070688).

Almost surely, 2^{221212100010001} is an apocalyptic number.

It is an amenable number.

221212100010001 is a deficient number, since it is larger than the sum of its proper divisors (7137236555503).

221212100010001 is a wasteful number, since it uses less digits than its factorization.

221212100010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42573831.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221212100010001 its reverse (100010001212122), we get a palindrome (321222101222123).

The spelling of 221212100010001 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred million, ten thousand, one".