11222020021 has 4 divisors (see below), whose sum is σ = 11222700832. Its totient is φ = 11221339212.

The previous prime is 11222020013. The next prime is 11222020049. The reversal of 11222020021 is 12002022211.

It is a happy number.

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: 12002022211 = 1549 ⋅7748239.

It is a cyclic number.

It is not a de Polignac number, because 11222020021 - 2³ = 11222020013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222019983 and 11222020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222020421) 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, 315051 + ... + 348856.

It is an arithmetic number, because the mean of its divisors is an integer number (2805675208).

Almost surely, 2^11222020021 is an apocalyptic number.

It is an amenable number.

11222020021 is a deficient number, since it is larger than the sum of its proper divisors (680811).

11222020021 is an equidigital number, since it uses as much as digits as its factorization.

11222020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680810.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 11222020021 its reverse (12002022211), we get a palindrome (23224042232).

The spelling of 11222020021 in words is "eleven billion, two hundred twenty-two million, twenty thousand, twenty-one".