21111322133 has 16 divisors (see below), whose sum is σ = 24048493056. Its totient is φ = 18344966640.

The previous prime is 21111322129. The next prime is 21111322147. The reversal of 21111322133 is 33122311112.

It is a happy number.

It is not a de Polignac number, because 21111322133 - 2² = 21111322129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111322153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347066 + ... + 403332.

It is an arithmetic number, because the mean of its divisors is an integer number (1503030816).

Almost surely, 2^21111322133 is an apocalyptic number.

21111322133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21111322133 is a deficient number, since it is larger than the sum of its proper divisors (2937170923).

21111322133 is a wasteful number, since it uses less digits than its factorization.

21111322133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57784.

The product of its digits is 216, while the sum is 20.

Adding to 21111322133 its reverse (33122311112), we get a palindrome (54233633245).

The spelling of 21111322133 in words is "twenty-one billion, one hundred eleven million, three hundred twenty-two thousand, one hundred thirty-three".