221020002001 has 16 divisors (see below), whose sum is σ = 228077700480. Its totient is φ = 214076903040.

The previous prime is 221020001999. The next prime is 221020002019. The reversal of 221020002001 is 100200020122.

It is a cyclic number.

It is not a de Polignac number, because 221020002001 - 2¹ = 221020001999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221020002041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2996596 + ... + 3069466.

It is an arithmetic number, because the mean of its divisors is an integer number (14254856280).

Almost surely, 2^221020002001 is an apocalyptic number.

It is an amenable number.

221020002001 is a deficient number, since it is larger than the sum of its proper divisors (7057698479).

221020002001 is an equidigital number, since it uses as much as digits as its factorization.

221020002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73656.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 221020002001 its reverse (100200020122), we get a palindrome (321220022123).

The spelling of 221020002001 in words is "two hundred twenty-one billion, twenty million, two thousand, one".