21420043041 has 8 divisors (see below), whose sum is σ = 28735273120. Its totient is φ = 14192420832.

The previous prime is 21420043033. The next prime is 21420043063. The reversal of 21420043041 is 14034002412.

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

It is not a de Polignac number, because 21420043041 - 2³ = 21420043033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21420042999 and 21420043017.

It is not an unprimeable number, because it can be changed into a prime (21420045041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21901396 + ... + 21902373.

It is an arithmetic number, because the mean of its divisors is an integer number (3591909140).

Almost surely, 2^21420043041 is an apocalyptic number.

It is an amenable number.

21420043041 is a deficient number, since it is larger than the sum of its proper divisors (7315230079).

21420043041 is a wasteful number, since it uses less digits than its factorization.

21420043041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43803935.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21420043041 its reverse (14034002412), we get a palindrome (35454045453).

The spelling of 21420043041 in words is "twenty-one billion, four hundred twenty million, forty-three thousand, forty-one".