21103132033 has 4 divisors (see below), whose sum is σ = 21116104240. Its totient is φ = 21090159828.

The previous prime is 21103132013. The next prime is 21103132051. The reversal of 21103132033 is 33023130112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103132033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103132033.

It is not an unprimeable number, because it can be changed into a prime (21103132013) 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 3 ways as a sum of consecutive naturals, for example, 6483663 + ... + 6486916.

It is an arithmetic number, because the mean of its divisors is an integer number (5279026060).

Almost surely, 2^21103132033 is an apocalyptic number.

It is an amenable number.

21103132033 is a deficient number, since it is larger than the sum of its proper divisors (12972207).

21103132033 is a wasteful number, since it uses less digits than its factorization.

21103132033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12972206.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21103132033 its reverse (33023130112), we get a palindrome (54126262145).

The spelling of 21103132033 in words is "twenty-one billion, one hundred three million, one hundred thirty-two thousand, thirty-three".