21031324442 has 8 divisors (see below), whose sum is σ = 31547628576. Its totient is φ = 10515448252.

The previous prime is 21031324411. The next prime is 21031324459. The reversal of 21031324442 is 24442313012.

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

It is a super-2 number, since 2×21031324442² (a number of 21 digits) contains 22 as substring.

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, 84233 + ... + 221715.

It is an arithmetic number, because the mean of its divisors is an integer number (3943453572).

Almost surely, 2^21031324442 is an apocalyptic number.

21031324442 is a deficient number, since it is larger than the sum of its proper divisors (10516304134).

21031324442 is a wasteful number, since it uses less digits than its factorization.

21031324442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213972.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21031324442 its reverse (24442313012), we get a palindrome (45473637454).

The spelling of 21031324442 in words is "twenty-one billion, thirty-one million, three hundred twenty-four thousand, four hundred forty-two".