21100432033 has 4 divisors (see below), whose sum is σ = 21100727088. Its totient is φ = 21100136980.

The previous prime is 21100432021. The next prime is 21100432049. The reversal of 21100432033 is 33023400112.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21100432033 - 2¹⁷ = 21100300961 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 21100432033.

It is not an unprimeable number, because it can be changed into a prime (21100432933) 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, 35118 + ... + 208408.

It is an arithmetic number, because the mean of its divisors is an integer number (5275181772).

Almost surely, 2^21100432033 is an apocalyptic number.

It is an amenable number.

21100432033 is a deficient number, since it is larger than the sum of its proper divisors (295055).

21100432033 is a wasteful number, since it uses less digits than its factorization.

21100432033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295054.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21100432033 its reverse (33023400112), we get a palindrome (54123832145).

The spelling of 21100432033 in words is "twenty-one billion, one hundred million, four hundred thirty-two thousand, thirty-three".