21102110642 has 16 divisors (see below), whose sum is σ = 33532794720. Its totient is φ = 9925167168.

The previous prime is 21102110641. The next prime is 21102110671. The reversal of 21102110642 is 24601120112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21102110641) 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, 97892 + ... + 227567.

It is an arithmetic number, because the mean of its divisors is an integer number (2095799670).

Almost surely, 2^21102110642 is an apocalyptic number.

21102110642 is a deficient number, since it is larger than the sum of its proper divisors (12430684078).

21102110642 is a wasteful number, since it uses less digits than its factorization.

21102110642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327385.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21102110642 its reverse (24601120112), we get a palindrome (45703230754).

The spelling of 21102110642 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, six hundred forty-two".