221021221010001 has 4 divisors (see below), whose sum is σ = 294694961346672. Its totient is φ = 147347480673332.

The previous prime is 221021221009987. The next prime is 221021221010039. The reversal of 221021221010001 is 100010122120122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221021221010001 - 2⁵ = 221021221009969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221021221010041) 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, 36836870168331 + ... + 36836870168336.

It is an arithmetic number, because the mean of its divisors is an integer number (73673740336668).

Almost surely, 2^{221021221010001} is an apocalyptic number.

It is an amenable number.

221021221010001 is a deficient number, since it is larger than the sum of its proper divisors (73673740336671).

221021221010001 is an equidigital number, since it uses as much as digits as its factorization.

221021221010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73673740336670.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221021221010001 its reverse (100010122120122), we get a palindrome (321031343130123).

The spelling of 221021221010001 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, ten thousand, one".