220221210001 has 4 divisors (see below), whose sum is σ = 237161303092. Its totient is φ = 203281116912.

The previous prime is 220221209953. The next prime is 220221210017. The reversal of 220221210001 is 100012122022.

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 93431092225 + 126790117776 = 305665^2 + 356076^2 .

It is a cyclic number.

It is not a de Polignac number, because 220221210001 - 2⁹ = 220221209489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 16940093077 = 220221210001 / (2 + 2 + 0 + 2 + 2 + 1 + 2 + 1 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220221210901) 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, 8470046526 + ... + 8470046551.

It is an arithmetic number, because the mean of its divisors is an integer number (59290325773).

Almost surely, 2^220221210001 is an apocalyptic number.

It is an amenable number.

220221210001 is a deficient number, since it is larger than the sum of its proper divisors (16940093091).

220221210001 is a wasteful number, since it uses less digits than its factorization.

220221210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16940093090.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220221210001 its reverse (100012122022), we get a palindrome (320233332023).

The spelling of 220221210001 in words is "two hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, one".