20211021011011 has 32 divisors (see below), whose sum is σ = 22359928808448. Its totient is φ = 18170991421440.

The previous prime is 20211021010891. The next prime is 20211021011089. The reversal of 20211021011011 is 11011012011202.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20211021011011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211021010982 and 20211021011000.

It is not an unprimeable number, because it can be changed into a prime (20211021014011) 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, 982872616 + ... + 982893178.

It is an arithmetic number, because the mean of its divisors is an integer number (698747775264).

Almost surely, 2^{20211021011011} is an apocalyptic number.

20211021011011 is a deficient number, since it is larger than the sum of its proper divisors (2148907797437).

20211021011011 is a wasteful number, since it uses less digits than its factorization.

20211021011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23811.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20211021011011 its reverse (11011012011202), we get a palindrome (31222033022213).

The spelling of 20211021011011 in words is "twenty trillion, two hundred eleven billion, twenty-one million, eleven thousand, eleven".