221202220011001 has 4 divisors (see below), whose sum is σ = 221210293996132. Its totient is φ = 221194146025872.

The previous prime is 221202220010977. The next prime is 221202220011011. The reversal of 221202220011001 is 100110022202122.

It is a happy number.

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 155517759896976 + 65684460114025 = 12470676^2 + 8104595^2 .

It is a cyclic number.

It is not a de Polignac number, because 221202220011001 - 2¹⁹ = 221202219486713 is a prime.

It is a super-2 number, since 2×221202220011001² (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 (221202220011011) 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, 4036951470 + ... + 4037006263.

It is an arithmetic number, because the mean of its divisors is an integer number (55302573499033).

Almost surely, 2^{221202220011001} is an apocalyptic number.

It is an amenable number.

221202220011001 is a deficient number, since it is larger than the sum of its proper divisors (8073985131).

221202220011001 is an equidigital number, since it uses as much as digits as its factorization.

221202220011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073985130.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221202220011001 its reverse (100110022202122), we get a palindrome (321312242213123).

The spelling of 221202220011001 in words is "two hundred twenty-one trillion, two hundred two billion, two hundred twenty million, eleven thousand, one".