20021220022001 has 12 divisors (see below), whose sum is σ = 22543546678212. Its totient is φ = 17757179616000.

The previous prime is 20021220021973. The next prime is 20021220022031. The reversal of 20021220022001 is 10022002212002.

It can be written as a sum of positive squares in 2 ways, for example, as 1123072182001 + 18898147840000 = 1059751^2 + 4347200^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20021220022001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20021220022031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2017856360 + ... + 2017866281.

It is an arithmetic number, because the mean of its divisors is an integer number (1878628889851).

Almost surely, 2^{20021220022001} is an apocalyptic number.

It is an amenable number.

20021220022001 is a deficient number, since it is larger than the sum of its proper divisors (2522326656211).

20021220022001 is a wasteful number, since it uses less digits than its factorization.

20021220022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035722704 (or 4035722693 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20021220022001 its reverse (10022002212002), we get a palindrome (30043222234003).

The spelling of 20021220022001 in words is "twenty trillion, twenty-one billion, two hundred twenty million, twenty-two thousand, one".