21023204242 has 8 divisors (see below), whose sum is σ = 31889130300. Its totient is φ = 10393494144.

The previous prime is 21023204201. The next prime is 21023204263. The reversal of 21023204242 is 24240232012.

It can be written as a sum of positive squares in 2 ways, for example, as 16607734641 + 4415469601 = 128871^2 + 66449^2 .

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

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, 59053767 + ... + 59054122.

Almost surely, 2^21023204242 is an apocalyptic number.

21023204242 is a deficient number, since it is larger than the sum of its proper divisors (10865926058).

21023204242 is a wasteful number, since it uses less digits than its factorization.

21023204242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118107980.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21023204242 its reverse (24240232012), we get a palindrome (45263436254).

The spelling of 21023204242 in words is "twenty-one billion, twenty-three million, two hundred four thousand, two hundred forty-two".