21442030421 has 8 divisors (see below), whose sum is σ = 24548249280. Its totient is φ = 18346579488.

The previous prime is 21442030409. The next prime is 21442030447. The reversal of 21442030421 is 12403024412.

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

It is a cyclic number.

It is not a de Polignac number, because 21442030421 - 2¹⁴ = 21442014037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442030451) 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, 2687711 + ... + 2695676.

It is an arithmetic number, because the mean of its divisors is an integer number (3068531160).

Almost surely, 2^21442030421 is an apocalyptic number.

It is an amenable number.

21442030421 is a deficient number, since it is larger than the sum of its proper divisors (3106218859).

21442030421 is an equidigital number, since it uses as much as digits as its factorization.

21442030421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5383963.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21442030421 its reverse (12403024412), we get a palindrome (33845054833).

The spelling of 21442030421 in words is "twenty-one billion, four hundred forty-two million, thirty thousand, four hundred twenty-one".