20011221122111 has 8 divisors (see below), whose sum is σ = 20710275603120. Its totient is φ = 19312767466048.

The previous prime is 20011221122077. The next prime is 20011221122159. The reversal of 20011221122111 is 11122112211002.

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 20011221122111 - 2⁶ = 20011221122047 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 20011221122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221122161) 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, 150138461 + ... + 150271686.

It is an arithmetic number, because the mean of its divisors is an integer number (2588784450390).

Almost surely, 2^{20011221122111} is an apocalyptic number.

20011221122111 is a deficient number, since it is larger than the sum of its proper divisors (699054481009).

20011221122111 is a wasteful number, since it uses less digits than its factorization.

20011221122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300412473.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20011221122111 its reverse (11122112211002), we get a palindrome (31133333333113).

The spelling of 20011221122111 in words is "twenty trillion, eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred eleven".