21024302042 has 8 divisors (see below), whose sum is σ = 31538113236. Its totient is φ = 10511597632.

The previous prime is 21024301981. The next prime is 21024302053. The reversal of 21024302042 is 24020342012.

It can be written as a sum of positive squares in 2 ways, for example, as 19906670281 + 1117631761 = 141091^2 + 33431^2 .

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, 227453 + ... + 306240.

Almost surely, 2^21024302042 is an apocalyptic number.

21024302042 is a deficient number, since it is larger than the sum of its proper divisors (10513811194).

21024302042 is a wasteful number, since it uses less digits than its factorization.

21024302042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553392.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21024302042 its reverse (24020342012), we get a palindrome (45044644054).

The spelling of 21024302042 in words is "twenty-one billion, twenty-four million, three hundred two thousand, forty-two".