11012020021 has 4 divisors (see below), whose sum is σ = 11017298592. Its totient is φ = 11006741452.

The previous prime is 11012020009. The next prime is 11012020051. The reversal of 11012020021 is 12002021011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12002021011 = 131 ⋅91618481.

It is a cyclic number.

It is not a de Polignac number, because 11012020021 - 2²³ = 11003631413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012020051) 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, 2636155 + ... + 2640328.

It is an arithmetic number, because the mean of its divisors is an integer number (2754324648).

Almost surely, 2^11012020021 is an apocalyptic number.

It is an amenable number.

11012020021 is a deficient number, since it is larger than the sum of its proper divisors (5278571).

11012020021 is an equidigital number, since it uses as much as digits as its factorization.

11012020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5278570.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11012020021 its reverse (12002021011), we get a palindrome (23014041032).

The spelling of 11012020021 in words is "eleven billion, twelve million, twenty thousand, twenty-one".