21034439989 has 8 divisors (see below), whose sum is σ = 21620141312. Its totient is φ = 20453126400.

The previous prime is 21034439963. The next prime is 21034440059. The reversal of 21034439989 is 98993443012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21034439989 - 2¹⁹ = 21033915701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034439939) 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, 1087212 + ... + 1106389.

It is an arithmetic number, because the mean of its divisors is an integer number (2702517664).

Almost surely, 2^21034439989 is an apocalyptic number.

It is an amenable number.

21034439989 is a deficient number, since it is larger than the sum of its proper divisors (585701323).

21034439989 is a wasteful number, since it uses less digits than its factorization.

21034439989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193867.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 21034439989 in words is "twenty-one billion, thirty-four million, four hundred thirty-nine thousand, nine hundred eighty-nine".