20123212211 has 4 divisors (see below), whose sum is σ = 20124902952. Its totient is φ = 20121521472.

The previous prime is 20123212183. The next prime is 20123212243. The reversal of 20123212211 is 11221232102.

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

It is a cyclic number.

It is not a de Polignac number, because 20123212211 - 2⁶ = 20123212147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123212211.

It is not an unprimeable number, because it can be changed into a prime (20123218211) 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 3 ways as a sum of consecutive naturals, for example, 827390 + ... + 851363.

It is an arithmetic number, because the mean of its divisors is an integer number (5031225738).

Almost surely, 2^20123212211 is an apocalyptic number.

20123212211 is a deficient number, since it is larger than the sum of its proper divisors (1690741).

20123212211 is a wasteful number, since it uses less digits than its factorization.

20123212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690740.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20123212211 its reverse (11221232102), we get a palindrome (31344444313).

The spelling of 20123212211 in words is "twenty billion, one hundred twenty-three million, two hundred twelve thousand, two hundred eleven".