21494935408 has 20 divisors (see below), whose sum is σ = 41696700040. Its totient is φ = 10734496704.

The previous prime is 21494935381. The next prime is 21494935421. The reversal of 21494935408 is 80453949412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797010 + ... + 823537.

It is an arithmetic number, because the mean of its divisors is an integer number (2084835002).

Almost surely, 2^21494935408 is an apocalyptic number.

It is an amenable number.

21494935408 is a deficient number, since it is larger than the sum of its proper divisors (20201764632).

21494935408 is a wasteful number, since it uses less digits than its factorization.

21494935408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621384 (or 1621378 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 21494935408 in words is "twenty-one billion, four hundred ninety-four million, nine hundred thirty-five thousand, four hundred eight".