21304102402 has 24 divisors (see below), whose sum is σ = 35265401136. Its totient is φ = 9645075000.

The previous prime is 21304102399. The next prime is 21304102403. The reversal of 21304102402 is 20420140312.

It is a self number, because there is not a number n which added to its sum of digits gives 21304102402.

It is not an unprimeable number, because it can be changed into a prime (21304102403) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 114624 + ... + 236107.

It is an arithmetic number, because the mean of its divisors is an integer number (1469391714).

Almost surely, 2^21304102402 is an apocalyptic number.

21304102402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21304102402 is a deficient number, since it is larger than the sum of its proper divisors (13961298734).

21304102402 is a wasteful number, since it uses less digits than its factorization.

21304102402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351006 (or 350995 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21304102402 its reverse (20420140312), we get a palindrome (41724242714).

The spelling of 21304102402 in words is "twenty-one billion, three hundred four million, one hundred two thousand, four hundred two".