21101223633 has 96 divisors (see below), whose sum is σ = 35754048000. Its totient is φ = 10992683520.

The previous prime is 21101223607. The next prime is 21101223641. The reversal of 21101223633 is 33632210112.

It is not a de Polignac number, because 21101223633 - 2¹⁰ = 21101222609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101223683) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14076118 + ... + 14077616.

It is an arithmetic number, because the mean of its divisors is an integer number (372438000).

Almost surely, 2^21101223633 is an apocalyptic number.

It is an amenable number.

21101223633 is a deficient number, since it is larger than the sum of its proper divisors (14652824367).

21101223633 is a wasteful number, since it uses less digits than its factorization.

21101223633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21101223633 its reverse (33632210112), we get a palindrome (54733433745).

The spelling of 21101223633 in words is "twenty-one billion, one hundred one million, two hundred twenty-three thousand, six hundred thirty-three".