20111121011011 has 8 divisors (see below), whose sum is σ = 20368505471744. Its totient is φ = 19855370737800.

The previous prime is 20111121010931. The next prime is 20111121011029. The reversal of 20111121011011 is 11011012111102.

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 20111121011011 - 2²¹ = 20111118913859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111121010982 and 20111121011000.

It is not an unprimeable number, because it can be changed into a prime (20111121011411) 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, 408522111 + ... + 408571336.

It is an arithmetic number, because the mean of its divisors is an integer number (2546063183968).

Almost surely, 2^{20111121011011} is an apocalyptic number.

20111121011011 is a deficient number, since it is larger than the sum of its proper divisors (257384460733).

20111121011011 is a wasteful number, since it uses less digits than its factorization.

20111121011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817093761.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 20111121011011 its reverse (11011012111102), we get a palindrome (31122133122113).

The spelling of 20111121011011 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-one million, eleven thousand, eleven".