21494935409 has 8 divisors (see below), whose sum is σ = 21529972992. Its totient is φ = 21459921120.

The previous prime is 21494935381. The next prime is 21494935421. The reversal of 21494935409 is 90453949412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21494935409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21494932409) 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, 2984717 + ... + 2991909.

It is an arithmetic number, because the mean of its divisors is an integer number (2691246624).

Almost surely, 2^21494935409 is an apocalyptic number.

It is an amenable number.

21494935409 is a deficient number, since it is larger than the sum of its proper divisors (35037583).

21494935409 is an equidigital number, since it uses as much as digits as its factorization.

21494935409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11647.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 21494935409 in words is "twenty-one billion, four hundred ninety-four million, nine hundred thirty-five thousand, four hundred nine".