21101001233 has 16 divisors (see below), whose sum is σ = 23312632896. Its totient is φ = 18979410240.

The previous prime is 21101001197. The next prime is 21101001253. The reversal of 21101001233 is 33210010112.

It is a cyclic number.

It is not a de Polignac number, because 21101001233 - 2⁶ = 21101001169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101001253) 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 15 ways as a sum of consecutive naturals, for example, 39491 + ... + 209192.

It is an arithmetic number, because the mean of its divisors is an integer number (1457039556).

Almost surely, 2^21101001233 is an apocalyptic number.

It is an amenable number.

21101001233 is a deficient number, since it is larger than the sum of its proper divisors (2211631663).

21101001233 is a wasteful number, since it uses less digits than its factorization.

21101001233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248864.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21101001233 its reverse (33210010112), we get a palindrome (54311011345).

The spelling of 21101001233 in words is "twenty-one billion, one hundred one million, one thousand, two hundred thirty-three".