20011220222011 has 8 divisors (see below), whose sum is σ = 20316858688224. Its totient is φ = 19706242597440.

The previous prime is 20011220221973. The next prime is 20011220222033. The reversal of 20011220222011 is 11022202211002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20011220222011 is a prime.

It is a super-2 number, since 2×20011220222011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011220222051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165149386 + ... + 165270511.

It is an arithmetic number, because the mean of its divisors is an integer number (2539607336028).

Almost surely, 2^{20011220222011} is an apocalyptic number.

20011220222011 is a deficient number, since it is larger than the sum of its proper divisors (305638466213).

20011220222011 is an equidigital number, since it uses as much as digits as its factorization.

20011220222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330420821.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20011220222011 its reverse (11022202211002), we get a palindrome (31033422433013).

It can be divided in two parts, 20011 and 220222011, that added together give a palindrome (220242022).

The spelling of 20011220222011 in words is "twenty trillion, eleven billion, two hundred twenty million, two hundred twenty-two thousand, eleven".