21529673378 has 8 divisors (see below), whose sum is σ = 32296777920. Its totient is φ = 10764080740.

The previous prime is 21529673353. The next prime is 21529673381. The reversal of 21529673378 is 87337692512.

It is a happy number.

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

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, 341678 + ... + 399753.

It is an arithmetic number, because the mean of its divisors is an integer number (4037097240).

Almost surely, 2^21529673378 is an apocalyptic number.

21529673378 is a deficient number, since it is larger than the sum of its proper divisors (10767104542).

21529673378 is a wasteful number, since it uses less digits than its factorization.

21529673378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755952.

The product of its digits is 3810240, while the sum is 53.

The spelling of 21529673378 in words is "twenty-one billion, five hundred twenty-nine million, six hundred seventy-three thousand, three hundred seventy-eight".