21421433041 has 4 divisors (see below), whose sum is σ = 21422256192. Its totient is φ = 21420609892.

The previous prime is 21421433009. The next prime is 21421433119. The reversal of 21421433041 is 14033412412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21421433041 - 2⁵ = 21421433009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21421432997 and 21421433015.

It is not an unprimeable number, because it can be changed into a prime (21421437041) 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, 371221 + ... + 425026.

It is an arithmetic number, because the mean of its divisors is an integer number (5355564048).

Almost surely, 2^21421433041 is an apocalyptic number.

It is an amenable number.

21421433041 is a deficient number, since it is larger than the sum of its proper divisors (823151).

21421433041 is an equidigital number, since it uses as much as digits as its factorization.

21421433041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823150.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21421433041 its reverse (14033412412), we get a palindrome (35454845453).

The spelling of 21421433041 in words is "twenty-one billion, four hundred twenty-one million, four hundred thirty-three thousand, forty-one".