21323042402 has 8 divisors (see below), whose sum is σ = 32062766700. Its totient is φ = 10635453504.

The previous prime is 21323042399. The next prime is 21323042431. The reversal of 21323042402 is 20424032312.

It can be written as a sum of positive squares in 2 ways, for example, as 15642254761 + 5680787641 = 125069^2 + 75371^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13032827 + ... + 13034462.

Almost surely, 2^21323042402 is an apocalyptic number.

21323042402 is a deficient number, since it is larger than the sum of its proper divisors (10739724298).

21323042402 is a wasteful number, since it uses less digits than its factorization.

21323042402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26067700.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21323042402 its reverse (20424032312), we get a palindrome (41747074714).

The spelling of 21323042402 in words is "twenty-one billion, three hundred twenty-three million, forty-two thousand, four hundred two".