21143225242 has 8 divisors (see below), whose sum is σ = 32188193856. Its totient is φ = 10413827292.

The previous prime is 21143225239. The next prime is 21143225269. The reversal of 21143225242 is 24252234112.

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 21143225242.

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, 78892498 + ... + 78892765.

It is an arithmetic number, because the mean of its divisors is an integer number (4023524232).

Almost surely, 2^21143225242 is an apocalyptic number.

21143225242 is a deficient number, since it is larger than the sum of its proper divisors (11044968614).

21143225242 is a wasteful number, since it uses less digits than its factorization.

21143225242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157785332.

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

Adding to 21143225242 its reverse (24252234112), we get a palindrome (45395459354).

The spelling of 21143225242 in words is "twenty-one billion, one hundred forty-three million, two hundred twenty-five thousand, two hundred forty-two".