11220021001 has 4 divisors (see below), whose sum is σ = 12822881152. Its totient is φ = 9617160852.

The previous prime is 11220020993. The next prime is 11220021013. The reversal of 11220021001 is 10012002211.

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: 10012002211 = 1987 ⋅5038753.

It is a cyclic number.

It is not a de Polignac number, because 11220021001 - 2³ = 11220020993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11220021041) 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, 801430065 + ... + 801430078.

It is an arithmetic number, because the mean of its divisors is an integer number (3205720288).

Almost surely, 2^11220021001 is an apocalyptic number.

It is an amenable number.

11220021001 is a deficient number, since it is larger than the sum of its proper divisors (1602860151).

11220021001 is an equidigital number, since it uses as much as digits as its factorization.

11220021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602860150.

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

Adding to 11220021001 its reverse (10012002211), we get a palindrome (21232023212).

The spelling of 11220021001 in words is "eleven billion, two hundred twenty million, twenty-one thousand, one".