21033222011 has 4 divisors (see below), whose sum is σ = 21172515024. Its totient is φ = 20893929000.

The previous prime is 21033221929. The next prime is 21033222031. The reversal of 21033222011 is 11022233012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21033222011 - 2³⁰ = 19959480187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033222031) 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, 69646280 + ... + 69646581.

It is an arithmetic number, because the mean of its divisors is an integer number (5293128756).

Almost surely, 2^21033222011 is an apocalyptic number.

21033222011 is a deficient number, since it is larger than the sum of its proper divisors (139293013).

21033222011 is a wasteful number, since it uses less digits than its factorization.

21033222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139293012.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21033222011 its reverse (11022233012), we get a palindrome (32055455023).

The spelling of 21033222011 in words is "twenty-one billion, thirty-three million, two hundred twenty-two thousand, eleven".