21254344042 has 8 divisors (see below), whose sum is σ = 32559846336. Its totient is φ = 10401061932.

The previous prime is 21254344039. The next prime is 21254344057. The reversal of 21254344042 is 24044345212.

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 = 21254343995 and 21254344013.

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, 113054928 + ... + 113055115.

It is an arithmetic number, because the mean of its divisors is an integer number (4069980792).

Almost surely, 2^21254344042 is an apocalyptic number.

21254344042 is a deficient number, since it is larger than the sum of its proper divisors (11305502294).

21254344042 is a wasteful number, since it uses less digits than its factorization.

21254344042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226110092.

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 21254344042 its reverse (24044345212), we get a palindrome (45298689254).

The spelling of 21254344042 in words is "twenty-one billion, two hundred fifty-four million, three hundred forty-four thousand, forty-two".