20011112120021 has 12 divisors (see below), whose sum is σ = 22356270234732. Its totient is φ = 17893691904000.

The previous prime is 20011112119993. The next prime is 20011112120057. The reversal of 20011112120021 is 12002121111002.

It can be written as a sum of positive squares in 2 ways, for example, as 835558699921 + 19175553420100 = 914089^2 + 4378990^2 .

It is not a de Polignac number, because 20011112120021 - 2³⁴ = 19993932250837 is a prime.

It is a super-2 number, since 2×20011112120021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20011112119978 and 20011112120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011112120521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1355575340 + ... + 1355590101.

It is an arithmetic number, because the mean of its divisors is an integer number (1863022519561).

Almost surely, 2^{20011112120021} is an apocalyptic number.

It is an amenable number.

20011112120021 is a deficient number, since it is larger than the sum of its proper divisors (2345158114711).

20011112120021 is a wasteful number, since it uses less digits than its factorization.

20011112120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2711165524 (or 2711165513 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20011112120021 its reverse (12002121111002), we get a palindrome (32013233231023).

The spelling of 20011112120021 in words is "twenty trillion, eleven billion, one hundred twelve million, one hundred twenty thousand, twenty-one".