21422143421 has 8 divisors (see below), whose sum is σ = 24549162240. Its totient is φ = 18311802768.

The previous prime is 21422143417. The next prime is 21422143451. The reversal of 21422143421 is 12434122412.

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

It is not a de Polignac number, because 21422143421 - 2² = 21422143417 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 (21422143451) 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, 4166786 + ... + 4171923.

It is an arithmetic number, because the mean of its divisors is an integer number (3068645280).

Almost surely, 2^21422143421 is an apocalyptic number.

It is an amenable number.

21422143421 is a deficient number, since it is larger than the sum of its proper divisors (3127018819).

21422143421 is an equidigital number, since it uses as much as digits as its factorization.

21422143421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8339083.

The product of its digits is 3072, while the sum is 26.

Adding to 21422143421 its reverse (12434122412), we get a palindrome (33856265833).

The spelling of 21422143421 in words is "twenty-one billion, four hundred twenty-two million, one hundred forty-three thousand, four hundred twenty-one".