21648402542842 has 8 divisors (see below), whose sum is σ = 34181688225600. Its totient is φ = 10254506467644.

The previous prime is 21648402542831. The next prime is 21648402542867. The reversal of 21648402542842 is 24824520484612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21648402542842.

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, 284847401842 + ... + 284847401917.

It is an arithmetic number, because the mean of its divisors is an integer number (4272711028200).

Almost surely, 2^{21648402542842} is an apocalyptic number.

21648402542842 is a deficient number, since it is larger than the sum of its proper divisors (12533285682758).

21648402542842 is a wasteful number, since it uses less digits than its factorization.

21648402542842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569694803780.

The product of its (nonzero) digits is 7864320, while the sum is 52.

The spelling of 21648402542842 in words is "twenty-one trillion, six hundred forty-eight billion, four hundred two million, five hundred forty-two thousand, eight hundred forty-two".