21122133133 has 4 divisors (see below), whose sum is σ = 21122525628. Its totient is φ = 21121740640.

The previous prime is 21122133127. The next prime is 21122133181. The reversal of 21122133133 is 33133122112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8863657609 + 12258475524 = 94147^2 + 110718^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122133133 - 2⁹ = 21122132621 is a prime.

It is a super-2 number, since 2×21122133133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122133233) 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 3 ways as a sum of consecutive naturals, for example, 99688 + ... + 228433.

It is an arithmetic number, because the mean of its divisors is an integer number (5280631407).

Almost surely, 2^21122133133 is an apocalyptic number.

It is an amenable number.

21122133133 is a deficient number, since it is larger than the sum of its proper divisors (392495).

21122133133 is an equidigital number, since it uses as much as digits as its factorization.

21122133133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392494.

The product of its digits is 648, while the sum is 22.

Adding to 21122133133 its reverse (33133122112), we get a palindrome (54255255245).

The spelling of 21122133133 in words is "twenty-one billion, one hundred twenty-two million, one hundred thirty-three thousand, one hundred thirty-three".