221021122110001 has 4 divisors (see below), whose sum is σ = 221051662551412. Its totient is φ = 220990581668592.

The previous prime is 221021122109999. The next prime is 221021122110013. The reversal of 221021122110001 is 100011221120122.

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 155642965733025 + 65378156376976 = 12475695^2 + 8085676^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021122110001 - 2¹ = 221021122109999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021122170001) 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, 15270209850 + ... + 15270224323.

It is an arithmetic number, because the mean of its divisors is an integer number (55262915637853).

Almost surely, 2^{221021122110001} is an apocalyptic number.

It is an amenable number.

221021122110001 is a deficient number, since it is larger than the sum of its proper divisors (30540441411).

221021122110001 is an equidigital number, since it uses as much as digits as its factorization.

221021122110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30540441410.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221021122110001 its reverse (100011221120122), we get a palindrome (321032343230123).

The spelling of 221021122110001 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-two million, one hundred ten thousand, one".