21103245442 has 8 divisors (see below), whose sum is σ = 32088496716. Its totient is φ = 10407079872.

The previous prime is 21103245421. The next prime is 21103245467. The reversal of 21103245442 is 24454230112.

It can be written as a sum of positive squares in 2 ways, for example, as 19734911361 + 1368334081 = 140481^2 + 36991^2 .

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 21103245442.

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, 72271243 + ... + 72271534.

Almost surely, 2^21103245442 is an apocalyptic number.

21103245442 is a deficient number, since it is larger than the sum of its proper divisors (10985251274).

21103245442 is a wasteful number, since it uses less digits than its factorization.

21103245442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144542852.

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

Adding to 21103245442 its reverse (24454230112), we get a palindrome (45557475554).

The spelling of 21103245442 in words is "twenty-one billion, one hundred three million, two hundred forty-five thousand, four hundred forty-two".