11211021000020 has 24 divisors (see below), whose sum is σ = 23547547381344. Its totient is φ = 4483569679776.

The previous prime is 11211020999977. The next prime is 11211021000029. The reversal of 11211021000020 is 2000012011211.

It is a junction number, because it is equal to n+sod(n) for n = 11211020999965 and 11211021000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211021000029) 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, 52310402 + ... + 52524281.

It is an arithmetic number, because the mean of its divisors is an integer number (981147807556).

Almost surely, 2^{11211021000020} is an apocalyptic number.

11211021000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211021000020 is an abundant number, since it is smaller than the sum of its proper divisors (12336526381324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11211021000020 is a wasteful number, since it uses less digits than its factorization.

11211021000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104840039 (or 104840037 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11211021000020 its reverse (2000012011211), we get a palindrome (13211033011231).

The spelling of 11211021000020 in words is "eleven trillion, two hundred eleven billion, twenty-one million, twenty", and thus it is an aban number.