11011312021 has 4 divisors (see below), whose sum is σ = 11017802412. Its totient is φ = 11004821632.

The previous prime is 11011312009. The next prime is 11011312049. The reversal of 11011312021 is 12021311011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12021311011 = 19777 ⋅607843.

It can be written as a sum of positive squares in 2 ways, for example, as 5141607025 + 5869704996 = 71705^2 + 76614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011312021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011311992 and 11011312010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011312001) 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, 3242650 + ... + 3246043.

It is an arithmetic number, because the mean of its divisors is an integer number (2754450603).

Almost surely, 2^11011312021 is an apocalyptic number.

It is an amenable number.

11011312021 is a deficient number, since it is larger than the sum of its proper divisors (6490391).

11011312021 is an equidigital number, since it uses as much as digits as its factorization.

11011312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6490390.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11011312021 its reverse (12021311011), we get a palindrome (23032623032).

The spelling of 11011312021 in words is "eleven billion, eleven million, three hundred twelve thousand, twenty-one".