221021102210201 has 4 divisors (see below), whose sum is σ = 221021193210804. Its totient is φ = 221021011209600.

The previous prime is 221021102210113. The next prime is 221021102210219. The reversal of 221021102210201 is 102012201120122.

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 91543466587225 + 129477635622976 = 9567835^2 + 11378824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021102210201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221021102210201.

It is not an unprimeable number, because it can be changed into a prime (221021102212201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41754320 + ... + 46748961.

It is an arithmetic number, because the mean of its divisors is an integer number (55255298302701).

Almost surely, 2^{221021102210201} is an apocalyptic number.

It is an amenable number.

221021102210201 is a deficient number, since it is larger than the sum of its proper divisors (91000603).

221021102210201 is an equidigital number, since it uses as much as digits as its factorization.

221021102210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91000602.

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

Adding to 221021102210201 its reverse (102012201120122), we get a palindrome (323033303330323).

The spelling of 221021102210201 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred two million, two hundred ten thousand, two hundred one".