21542378594 has 8 divisors (see below), whose sum is σ = 35251165008. Its totient is φ = 9791990260.

The previous prime is 21542378579. The next prime is 21542378603. The reversal of 21542378594 is 49587324512.

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, 489599492 + ... + 489599535.

It is an arithmetic number, because the mean of its divisors is an integer number (4406395626).

Almost surely, 2^21542378594 is an apocalyptic number.

21542378594 is a deficient number, since it is larger than the sum of its proper divisors (13708786414).

21542378594 is a wasteful number, since it uses less digits than its factorization.

21542378594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979199040.

The product of its digits is 2419200, while the sum is 50.

The spelling of 21542378594 in words is "twenty-one billion, five hundred forty-two million, three hundred seventy-eight thousand, five hundred ninety-four".