221001210022001 has 4 divisors (see below), whose sum is σ = 228621941402100. Its totient is φ = 213380478641904.

The previous prime is 221001210021983. The next prime is 221001210022051. The reversal of 221001210022001 is 100220012100122.

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 163464509784976 + 57536700237025 = 12785324^2 + 7585295^2 .

It is not a de Polignac number, because 221001210022001 - 2³⁴ = 220984030152817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001210022051) 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, 3810365690006 + ... + 3810365690063.

It is an arithmetic number, because the mean of its divisors is an integer number (57155485350525).

Almost surely, 2^{221001210022001} is an apocalyptic number.

It is an amenable number.

221001210022001 is a deficient number, since it is larger than the sum of its proper divisors (7620731380099).

221001210022001 is an equidigital number, since it uses as much as digits as its factorization.

221001210022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7620731380098.

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

Adding to 221001210022001 its reverse (100220012100122), we get a palindrome (321221222122123).

The spelling of 221001210022001 in words is "two hundred twenty-one trillion, one billion, two hundred ten million, twenty-two thousand, one".