20011220001001 has 4 divisors (see below), whose sum is σ = 20017510862404. Its totient is φ = 20004929139600.

The previous prime is 20011220000953. The next prime is 20011220001053. The reversal of 20011220001001 is 10010002211002.

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 10906004275776 + 9105215725225 = 3302424^2 + 3017485^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011220001001 - 2⁷ = 20011220000873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011220091001) 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, 3145425930 + ... + 3145432291.

It is an arithmetic number, because the mean of its divisors is an integer number (5004377715601).

Almost surely, 2^{20011220001001} is an apocalyptic number.

It is an amenable number.

20011220001001 is a deficient number, since it is larger than the sum of its proper divisors (6290861403).

20011220001001 is an equidigital number, since it uses as much as digits as its factorization.

20011220001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290861402.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20011220001001 its reverse (10010002211002), we get a palindrome (30021222212003).

The spelling of 20011220001001 in words is "twenty trillion, eleven billion, two hundred twenty million, one thousand, one".