221026203011 has 4 divisors (see below), whose sum is σ = 221221975800. Its totient is φ = 220830430224.

The previous prime is 221026202989. The next prime is 221026203017. The reversal of 221026203011 is 110302620122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110302620122 = 2 ⋅55151310061.

It is a cyclic number.

It is not a de Polignac number, because 221026203011 - 2³⁰ = 219952461187 is a prime.

It is a super-2 number, since 2×221026203011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221026203017) 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, 97884701 + ... + 97886958.

It is an arithmetic number, because the mean of its divisors is an integer number (55305493950).

Almost surely, 2^221026203011 is an apocalyptic number.

221026203011 is a deficient number, since it is larger than the sum of its proper divisors (195772789).

221026203011 is a wasteful number, since it uses less digits than its factorization.

221026203011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195772788.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221026203011 its reverse (110302620122), we get a palindrome (331328823133).

The spelling of 221026203011 in words is "two hundred twenty-one billion, twenty-six million, two hundred three thousand, eleven".