221210211220001 has 4 divisors (see below), whose sum is σ = 221683894756272. Its totient is φ = 220736527683732.

The previous prime is 221210211219947. The next prime is 221210211220007. The reversal of 221210211220001 is 100022112012122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221210211220001 - 2⁶ = 221210211219937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210211220007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236841767435 + ... + 236841768368.

It is an arithmetic number, because the mean of its divisors is an integer number (55420973689068).

Almost surely, 2^{221210211220001} is an apocalyptic number.

It is an amenable number.

221210211220001 is a deficient number, since it is larger than the sum of its proper divisors (473683536271).

221210211220001 is an equidigital number, since it uses as much as digits as its factorization.

221210211220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473683536270.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221210211220001 its reverse (100022112012122), we get a palindrome (321232323232123).

The spelling of 221210211220001 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty thousand, one".