20012211101 has 4 divisors (see below), whose sum is σ = 20013605472. Its totient is φ = 20010816732.

The previous prime is 20012211097. The next prime is 20012211143. The reversal of 20012211101 is 10111221002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20012211101 - 2² = 20012211097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012211001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675431 + ... + 704436.

It is an arithmetic number, because the mean of its divisors is an integer number (5003401368).

Almost surely, 2^20012211101 is an apocalyptic number.

It is an amenable number.

20012211101 is a deficient number, since it is larger than the sum of its proper divisors (1394371).

20012211101 is a wasteful number, since it uses less digits than its factorization.

20012211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394370.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20012211101 its reverse (10111221002), we get a palindrome (30123432103).

Subtracting from 20012211101 its reverse (10111221002), we obtain a palindrome (9900990099).

The spelling of 20012211101 in words is "twenty billion, twelve million, two hundred eleven thousand, one hundred one".