221201121221201 has 16 divisors (see below), whose sum is σ = 245158803888768. Its totient is φ = 197908697952000.

The previous prime is 221201121221177. The next prime is 221201121221233. The reversal of 221201121221201 is 102122121102122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201121221201 is a prime.

It is a super-3 number, since 3×221201121221201³ (a number of 44 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221201121241201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595925000 + ... + 596296073.

It is an arithmetic number, because the mean of its divisors is an integer number (15322425243048).

Almost surely, 2^{221201121221201} is an apocalyptic number.

It is an amenable number.

221201121221201 is a deficient number, since it is larger than the sum of its proper divisors (23957682667567).

221201121221201 is a wasteful number, since it uses less digits than its factorization.

221201121221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192221352.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221201121221201 its reverse (102122121102122), we get a palindrome (323323242323323).

The spelling of 221201121221201 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred one".