20012221011 has 4 divisors (see below), whose sum is σ = 26682961352. Its totient is φ = 13341480672.

The previous prime is 20012220983. The next prime is 20012221063. The reversal of 20012221011 is 11012221002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20012221011 - 2⁶ = 20012220947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012221091) 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, 3335370166 + ... + 3335370171.

It is an arithmetic number, because the mean of its divisors is an integer number (6670740338).

Almost surely, 2^20012221011 is an apocalyptic number.

20012221011 is a deficient number, since it is larger than the sum of its proper divisors (6670740341).

20012221011 is an equidigital number, since it uses as much as digits as its factorization.

20012221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6670740340.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20012221011 its reverse (11012221002), we get a palindrome (31024442013).

Subtracting from 20012221011 its reverse (11012221002), we obtain a palindrome (9000000009).

The spelling of 20012221011 in words is "twenty billion, twelve million, two hundred twenty-one thousand, eleven".