21432215242 has 8 divisors (see below), whose sum is σ = 33185365632. Its totient is φ = 10370426700.

The previous prime is 21432215227. The next prime is 21432215267. The reversal of 21432215242 is 24251223412.

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 21432215242.

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, 172840384 + ... + 172840507.

It is an arithmetic number, because the mean of its divisors is an integer number (4148170704).

Almost surely, 2^21432215242 is an apocalyptic number.

21432215242 is a deficient number, since it is larger than the sum of its proper divisors (11753150390).

21432215242 is a wasteful number, since it uses less digits than its factorization.

21432215242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345680924.

The product of its digits is 7680, while the sum is 28.

Adding to 21432215242 its reverse (24251223412), we get a palindrome (45683438654).

The spelling of 21432215242 in words is "twenty-one billion, four hundred thirty-two million, two hundred fifteen thousand, two hundred forty-two".