21424004330 has 32 divisors (see below), whose sum is σ = 39953865600. Its totient is φ = 8261468992.

The previous prime is 21424004323. The next prime is 21424004351. The reversal of 21424004330 is 3340042412.

It is a junction number, because it is equal to n+sod(n) for n = 21424004296 and 21424004305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135059 + ... + 247161.

It is an arithmetic number, because the mean of its divisors is an integer number (1248558300).

Almost surely, 2^21424004330 is an apocalyptic number.

21424004330 is a deficient number, since it is larger than the sum of its proper divisors (18529861270).

21424004330 is a wasteful number, since it uses less digits than its factorization.

21424004330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112798.

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

Adding to 21424004330 its reverse (3340042412), we get a palindrome (24764046742).

The spelling of 21424004330 in words is "twenty-one billion, four hundred twenty-four million, four thousand, three hundred thirty".