21234422401 has 4 divisors (see below), whose sum is σ = 22352023600. Its totient is φ = 20116821204.

The previous prime is 21234422393. The next prime is 21234422449. The reversal of 21234422401 is 10422443212.

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 21234422401 - 2³ = 21234422393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234422471) 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, 558800571 + ... + 558800608.

It is an arithmetic number, because the mean of its divisors is an integer number (5588005900).

Almost surely, 2^21234422401 is an apocalyptic number.

It is an amenable number.

21234422401 is a deficient number, since it is larger than the sum of its proper divisors (1117601199).

21234422401 is a wasteful number, since it uses less digits than its factorization.

21234422401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117601198.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21234422401 its reverse (10422443212), we get a palindrome (31656865613).

The spelling of 21234422401 in words is "twenty-one billion, two hundred thirty-four million, four hundred twenty-two thousand, four hundred one".