21321230102 has 16 divisors (see below), whose sum is σ = 34191904032. Its totient is φ = 9936105600.

The previous prime is 21321230101. The next prime is 21321230111. The reversal of 21321230102 is 20103212312.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321230101) 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, 3040649 + ... + 3047652.

It is an arithmetic number, because the mean of its divisors is an integer number (2136994002).

Almost surely, 2^21321230102 is an apocalyptic number.

21321230102 is a deficient number, since it is larger than the sum of its proper divisors (12870673930).

21321230102 is a wasteful number, since it uses less digits than its factorization.

21321230102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6088423.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21321230102 its reverse (20103212312), we get a palindrome (41424442414).

The spelling of 21321230102 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty thousand, one hundred two".