221210021122201 has 4 divisors (see below), whose sum is σ = 221301543681972. Its totient is φ = 221118498562432.

The previous prime is 221210021122133. The next prime is 221210021122219. The reversal of 221210021122201 is 102221120012122.

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 168893442801801 + 52316578320400 = 12995901^2 + 7233020^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210021122201 - 2¹⁷ = 221210020991129 is a prime.

It is a super-2 number, since 2×221210021122201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210021122241) 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, 45761276260 + ... + 45761281093.

It is an arithmetic number, because the mean of its divisors is an integer number (55325385920493).

Almost surely, 2^{221210021122201} is an apocalyptic number.

It is an amenable number.

221210021122201 is a deficient number, since it is larger than the sum of its proper divisors (91522559771).

221210021122201 is an equidigital number, since it uses as much as digits as its factorization.

221210021122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91522559770.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221210021122201 its reverse (102221120012122), we get a palindrome (323431141134323).

The spelling of 221210021122201 in words is "two hundred twenty-one trillion, two hundred ten billion, twenty-one million, one hundred twenty-two thousand, two hundred one".