21130303442 has 8 divisors (see below), whose sum is σ = 33559893756. Its totient is φ = 9943672192.

The previous prime is 21130303429. The next prime is 21130303487. The reversal of 21130303442 is 24430303112.

It can be written as a sum of positive squares in 2 ways, for example, as 20340749641 + 789553801 = 142621^2 + 28099^2 .

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, 310739723 + ... + 310739790.

Almost surely, 2^21130303442 is an apocalyptic number.

21130303442 is a deficient number, since it is larger than the sum of its proper divisors (12429590314).

21130303442 is a wasteful number, since it uses less digits than its factorization.

21130303442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621479532.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21130303442 its reverse (24430303112), we get a palindrome (45560606554).

The spelling of 21130303442 in words is "twenty-one billion, one hundred thirty million, three hundred three thousand, four hundred forty-two".