20011001220111 has 32 divisors (see below), whose sum is σ = 29134381264128. Its totient is φ = 12116437712640.

The previous prime is 20011001220103. The next prime is 20011001220233. The reversal of 20011001220111 is 11102210011002.

It is not a de Polignac number, because 20011001220111 - 2³ = 20011001220103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011001220101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202300581 + ... + 202399473.

It is an arithmetic number, because the mean of its divisors is an integer number (910449414504).

Almost surely, 2^{20011001220111} is an apocalyptic number.

20011001220111 is a deficient number, since it is larger than the sum of its proper divisors (9123380044017).

20011001220111 is a wasteful number, since it uses less digits than its factorization.

20011001220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104631.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20011001220111 its reverse (11102210011002), we get a palindrome (31113211231113).

The spelling of 20011001220111 in words is "twenty trillion, eleven billion, one million, two hundred twenty thousand, one hundred eleven".