21123301133 has 16 divisors (see below), whose sum is σ = 23543930880. Its totient is φ = 18786409200.

The previous prime is 21123301099. The next prime is 21123301169. The reversal of 21123301133 is 33110332112.

It is a cyclic number.

It is not a de Polignac number, because 21123301133 - 2¹⁶ = 21123235597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123301183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1435628 + ... + 1450266.

It is an arithmetic number, because the mean of its divisors is an integer number (1471495680).

Almost surely, 2^21123301133 is an apocalyptic number.

It is an amenable number.

21123301133 is a deficient number, since it is larger than the sum of its proper divisors (2420629747).

21123301133 is a wasteful number, since it uses less digits than its factorization.

21123301133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17488.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21123301133 its reverse (33110332112), we get a palindrome (54233633245).

The spelling of 21123301133 in words is "twenty-one billion, one hundred twenty-three million, three hundred one thousand, one hundred thirty-three".