21231430042 has 8 divisors (see below), whose sum is σ = 33231803616. Its totient is φ = 10154162172.

The previous prime is 21231430013. The next prime is 21231430061. The reversal of 21231430042 is 24003413212.

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 = 21231429995 and 21231430022.

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, 230776368 + ... + 230776459.

It is an arithmetic number, because the mean of its divisors is an integer number (4153975452).

Almost surely, 2^21231430042 is an apocalyptic number.

21231430042 is a deficient number, since it is larger than the sum of its proper divisors (12000373574).

21231430042 is a wasteful number, since it uses less digits than its factorization.

21231430042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461552852.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21231430042 its reverse (24003413212), we get a palindrome (45234843254).

The spelling of 21231430042 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty thousand, forty-two".