21124331042 has 8 divisors (see below), whose sum is σ = 32542888476. Its totient is φ = 10276701552.

The previous prime is 21124331021. The next prime is 21124331047. The reversal of 21124331042 is 24013342112.

It can be written as a sum of positive squares in 2 ways, for example, as 18911475361 + 2212855681 = 137519^2 + 47041^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21124330999 and 21124331017.

It is not an unprimeable number, because it can be changed into a prime (21124331047) 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, 142731893 + ... + 142732040.

Almost surely, 2^21124331042 is an apocalyptic number.

21124331042 is a deficient number, since it is larger than the sum of its proper divisors (11418557434).

21124331042 is a wasteful number, since it uses less digits than its factorization.

21124331042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285463972.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21124331042 its reverse (24013342112), we get a palindrome (45137673154).

The spelling of 21124331042 in words is "twenty-one billion, one hundred twenty-four million, three hundred thirty-one thousand, forty-two".