21323342634 has 32 divisors (see below), whose sum is σ = 47286348480. Its totient is φ = 6355689600.

The previous prime is 21323342597. The next prime is 21323342657. The reversal of 21323342634 is 43624332312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 21323342595 and 21323342604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2644179 + ... + 2652230.

It is an arithmetic number, because the mean of its divisors is an integer number (1477698390).

Almost surely, 2^21323342634 is an apocalyptic number.

21323342634 is an abundant number, since it is smaller than the sum of its proper divisors (25963005846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323342634 is a wasteful number, since it uses less digits than its factorization.

21323342634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5296486.

The product of its digits is 62208, while the sum is 33.

Adding to 21323342634 its reverse (43624332312), we get a palindrome (64947674946).

The spelling of 21323342634 in words is "twenty-one billion, three hundred twenty-three million, three hundred forty-two thousand, six hundred thirty-four".