21304432402 has 16 divisors (see below), whose sum is σ = 36912493152. Its totient is φ = 9114195520.

The previous prime is 21304432399. The next prime is 21304432403. The reversal of 21304432402 is 20423440312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21304432403) 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, 28481488 + ... + 28482235.

It is an arithmetic number, because the mean of its divisors is an integer number (2307030822).

Almost surely, 2^21304432402 is an apocalyptic number.

21304432402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21304432402 is a deficient number, since it is larger than the sum of its proper divisors (15608060750).

21304432402 is a wasteful number, since it uses less digits than its factorization.

21304432402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56963753.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21304432402 its reverse (20423440312), we get a palindrome (41727872714).

The spelling of 21304432402 in words is "twenty-one billion, three hundred four million, four hundred thirty-two thousand, four hundred two".