20111011011021 has 16 divisors (see below), whose sum is σ = 30645605104128. Its totient is φ = 11491910670000.

The previous prime is 20111011010983. The next prime is 20111011011037. The reversal of 20111011011021 is 12011011011102.

It is not a de Polignac number, because 20111011011021 - 2¹¹ = 20111011008973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111011010988 and 20111011011006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111011011071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1360155 + ... + 6486296.

It is an arithmetic number, because the mean of its divisors is an integer number (1915350319008).

Almost surely, 2^{20111011011021} is an apocalyptic number.

20111011011021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20111011011021 is a deficient number, since it is larger than the sum of its proper divisors (10534594093107).

20111011011021 is a wasteful number, since it uses less digits than its factorization.

20111011011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7968512.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 20111011011021 its reverse (12011011011102), we get a palindrome (32122022022123).

The spelling of 20111011011021 in words is "twenty trillion, one hundred eleven billion, eleven million, eleven thousand, twenty-one".