21240662842 has 8 divisors (see below), whose sum is σ = 36412564896. Its totient is φ = 9103141212.

The previous prime is 21240662831. The next prime is 21240662843. The reversal of 21240662842 is 24826604212.

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

It is not an unprimeable number, because it can be changed into a prime (21240662843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758595088 + ... + 758595115.

It is an arithmetic number, because the mean of its divisors is an integer number (4551570612).

Almost surely, 2^21240662842 is an apocalyptic number.

21240662842 is a deficient number, since it is larger than the sum of its proper divisors (15171902054).

21240662842 is a wasteful number, since it uses less digits than its factorization.

21240662842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517190212.

The product of its (nonzero) digits is 73728, while the sum is 37.

The spelling of 21240662842 in words is "twenty-one billion, two hundred forty million, six hundred sixty-two thousand, eight hundred forty-two".