221200021210001 has 4 divisors (see below), whose sum is σ = 223390120430004. Its totient is φ = 219009921990000.

The previous prime is 221200021209971. The next prime is 221200021210019. The reversal of 221200021210001 is 100012120002122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 191830948593025 + 29369072616976 = 13850305^2 + 5419324^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200021210001 - 2¹⁰ = 221200021208977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221200021210031) 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, 1095049609850 + ... + 1095049610051.

It is an arithmetic number, because the mean of its divisors is an integer number (55847530107501).

Almost surely, 2^{221200021210001} is an apocalyptic number.

It is an amenable number.

221200021210001 is a deficient number, since it is larger than the sum of its proper divisors (2190099220003).

221200021210001 is a wasteful number, since it uses less digits than its factorization.

221200021210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190099220002.

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

Adding to 221200021210001 its reverse (100012120002122), we get a palindrome (321212141212123).

The spelling of 221200021210001 in words is "two hundred twenty-one trillion, two hundred billion, twenty-one million, two hundred ten thousand, one".