21031331042 has 8 divisors (see below), whose sum is σ = 32081691600. Its totient is φ = 10337433844.

The previous prime is 21031331017. The next prime is 21031331047. The reversal of 21031331042 is 24013313012.

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

It is not an unprimeable number, because it can be changed into a prime (21031331047) 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, 89115692 + ... + 89115927.

It is an arithmetic number, because the mean of its divisors is an integer number (4010211450).

Almost surely, 2^21031331042 is an apocalyptic number.

21031331042 is a deficient number, since it is larger than the sum of its proper divisors (11050360558).

21031331042 is a wasteful number, since it uses less digits than its factorization.

21031331042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178231680.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21031331042 its reverse (24013313012), we get a palindrome (45044644054).

The spelling of 21031331042 in words is "twenty-one billion, thirty-one million, three hundred thirty-one thousand, forty-two".