11220001021 has 4 divisors (see below), whose sum is σ = 11234079612. Its totient is φ = 11205922432.

The previous prime is 11220001007. The next prime is 11220001033. The reversal of 11220001021 is 12010002211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12010002211 = 43 ⋅279302377.

It can be written as a sum of positive squares in 2 ways, for example, as 9479943225 + 1740057796 = 97365^2 + 41714^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220001021 - 2⁷ = 11220000893 is a prime.

It is a super-2 number, since 2×11220001021² (a number of 21 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 = 11220000989 and 11220001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220001321) 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, 7038100 + ... + 7039693.

It is an arithmetic number, because the mean of its divisors is an integer number (2808519903).

Almost surely, 2^11220001021 is an apocalyptic number.

It is an amenable number.

11220001021 is a deficient number, since it is larger than the sum of its proper divisors (14078591).

11220001021 is an equidigital number, since it uses as much as digits as its factorization.

11220001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14078590.

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

Adding to 11220001021 its reverse (12010002211), we get a palindrome (23230003232).

The spelling of 11220001021 in words is "eleven billion, two hundred twenty million, one thousand, twenty-one".