20051311211 has 8 divisors (see below), whose sum is σ = 21621440400. Its totient is φ = 18532661760.

The previous prime is 20051311207. The next prime is 20051311261. The reversal of 20051311211 is 11211315002.

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

It is a cyclic number.

It is not a de Polignac number, because 20051311211 - 2² = 20051311207 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 20051311211.

It is not an unprimeable number, because it can be changed into a prime (20051311261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12869126 + ... + 12870683.

It is an arithmetic number, because the mean of its divisors is an integer number (2702680050).

Almost surely, 2^20051311211 is an apocalyptic number.

20051311211 is a deficient number, since it is larger than the sum of its proper divisors (1570129189).

20051311211 is a wasteful number, since it uses less digits than its factorization.

20051311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25739869.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 20051311211 its reverse (11211315002), we get a palindrome (31262626213).

The spelling of 20051311211 in words is "twenty billion, fifty-one million, three hundred eleven thousand, two hundred eleven".