21320312102 has 8 divisors (see below), whose sum is σ = 33861672216. Its totient is φ = 10033088032.

The previous prime is 21320312081. The next prime is 21320312147. The reversal of 21320312102 is 20121302312.

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

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313533968 + ... + 313534035.

It is an arithmetic number, because the mean of its divisors is an integer number (4232709027).

Almost surely, 2^21320312102 is an apocalyptic number.

21320312102 is a deficient number, since it is larger than the sum of its proper divisors (12541360114).

21320312102 is a wasteful number, since it uses less digits than its factorization.

21320312102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627068022.

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

Adding to 21320312102 its reverse (20121302312), we get a palindrome (41441614414).

The spelling of 21320312102 in words is "twenty-one billion, three hundred twenty million, three hundred twelve thousand, one hundred two".