21242422246 has 8 divisors (see below), whose sum is σ = 31864588704. Its totient is φ = 10620892680.

The previous prime is 21242422177. The next prime is 21242422247. The reversal of 21242422246 is 64222424212.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242422247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64590 + ... + 216001.

It is an arithmetic number, because the mean of its divisors is an integer number (3983073588).

Almost surely, 2^21242422246 is an apocalyptic number.

21242422246 is a deficient number, since it is larger than the sum of its proper divisors (10622166458).

21242422246 is a wasteful number, since it uses less digits than its factorization.

21242422246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318446.

The product of its digits is 24576, while the sum is 31.

Adding to 21242422246 its reverse (64222424212), we get a palindrome (85464846458).

The spelling of 21242422246 in words is "twenty-one billion, two hundred forty-two million, four hundred twenty-two thousand, two hundred forty-six".