21101110233 has 8 divisors (see below), whose sum is σ = 32154072768. Its totient is φ = 12057777264.

The previous prime is 21101110207. The next prime is 21101110237. The reversal of 21101110233 is 33201110112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21101110233 - 2⁹ = 21101109721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101110237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502407366 + ... + 502407407.

It is an arithmetic number, because the mean of its divisors is an integer number (4019259096).

Almost surely, 2^21101110233 is an apocalyptic number.

It is an amenable number.

21101110233 is a deficient number, since it is larger than the sum of its proper divisors (11052962535).

21101110233 is a wasteful number, since it uses less digits than its factorization.

21101110233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004814783.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21101110233 its reverse (33201110112), we get a palindrome (54302220345).

The spelling of 21101110233 in words is "twenty-one billion, one hundred one million, one hundred ten thousand, two hundred thirty-three".