21400426205 has 8 divisors (see below), whose sum is σ = 25725489504. Its totient is φ = 17090355600.

The previous prime is 21400426193. The next prime is 21400426213. The reversal of 21400426205 is 50262400412.

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

It is not a de Polignac number, because 21400426205 - 2¹⁰ = 21400425181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3745031 + ... + 3750740.

It is an arithmetic number, because the mean of its divisors is an integer number (3215686188).

Almost surely, 2^21400426205 is an apocalyptic number.

It is an amenable number.

21400426205 is a deficient number, since it is larger than the sum of its proper divisors (4325063299).

21400426205 is an equidigital number, since it uses as much as digits as its factorization.

21400426205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7496347.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21400426205 its reverse (50262400412), we get a palindrome (71662826617).

The spelling of 21400426205 in words is "twenty-one billion, four hundred million, four hundred twenty-six thousand, two hundred five".