21133122011 has 8 divisors (see below), whose sum is σ = 21288671040. Its totient is φ = 20977623432.

The previous prime is 21133121969. The next prime is 21133122013. The reversal of 21133122011 is 11022133112.

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

It is a cyclic number.

It is not a de Polignac number, because 21133122011 - 2²² = 21128927707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133122013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416356 + ... + 1431198.

It is an arithmetic number, because the mean of its divisors is an integer number (2661083880).

Almost surely, 2^21133122011 is an apocalyptic number.

21133122011 is a deficient number, since it is larger than the sum of its proper divisors (155549029).

21133122011 is a wasteful number, since it uses less digits than its factorization.

21133122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25225.

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

Adding to 21133122011 its reverse (11022133112), we get a palindrome (32155255123).

The spelling of 21133122011 in words is "twenty-one billion, one hundred thirty-three million, one hundred twenty-two thousand, eleven".