21738970459 has 8 divisors (see below), whose sum is σ = 22493362320. Its totient is φ = 20984896800.

The previous prime is 21738970447. The next prime is 21738970501. The reversal of 21738970459 is 95407983712.

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 21738970459 - 2¹⁷ = 21738839387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21738970159) 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, 63864 + ... + 218074.

It is an arithmetic number, because the mean of its divisors is an integer number (2811670290).

Almost surely, 2^21738970459 is an apocalyptic number.

21738970459 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21738970459 is a deficient number, since it is larger than the sum of its proper divisors (754391861).

21738970459 is a wasteful number, since it uses less digits than its factorization.

21738970459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159101.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 21738970459 in words is "twenty-one billion, seven hundred thirty-eight million, nine hundred seventy thousand, four hundred fifty-nine".