21133221011 has 8 divisors (see below), whose sum is σ = 24985089120. Its totient is φ = 17489562048.

The previous prime is 21133220993. The next prime is 21133221013. The reversal of 21133221011 is 11012233112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21133221011 - 2³⁴ = 3953351827 is a prime.

It is a super-2 number, since 2×21133221011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133221013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52052066 + ... + 52052471.

It is an arithmetic number, because the mean of its divisors is an integer number (3123136140).

Almost surely, 2^21133221011 is an apocalyptic number.

21133221011 is a deficient number, since it is larger than the sum of its proper divisors (3851868109).

21133221011 is a wasteful number, since it uses less digits than its factorization.

21133221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104104573.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21133221011 its reverse (11012233112), we get a palindrome (32145454123).

The spelling of 21133221011 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-one thousand, eleven".