20111102012021 has 4 divisors (see below), whose sum is σ = 20113930982700. Its totient is φ = 20108273041344.

The previous prime is 20111102012009. The next prime is 20111102012039. The reversal of 20111102012021 is 12021020111102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13856671227025 + 6254430784996 = 3722455^2 + 2500886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111102012021 - 2²² = 20111097817717 is a prime.

It is a super-2 number, since 2×20111102012021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111102011987 and 20111102012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111102012041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1414474676 + ... + 1414488893.

It is an arithmetic number, because the mean of its divisors is an integer number (5028482745675).

Almost surely, 2^{20111102012021} is an apocalyptic number.

It is an amenable number.

20111102012021 is a deficient number, since it is larger than the sum of its proper divisors (2828970679).

20111102012021 is an equidigital number, since it uses as much as digits as its factorization.

20111102012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828970678.

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

Adding to 20111102012021 its reverse (12021020111102), we get a palindrome (32132122123123).

The spelling of 20111102012021 in words is "twenty trillion, one hundred eleven billion, one hundred two million, twelve thousand, twenty-one".