21401424211 has 4 divisors (see below), whose sum is σ = 21421827000. Its totient is φ = 21381021424.

The previous prime is 21401424127. The next prime is 21401424223. The reversal of 21401424211 is 11242410412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21401424211 - 2¹⁷ = 21401293139 is a prime.

It is a super-3 number, since 3×21401424211³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21401424241) 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, 10199821 + ... + 10201918.

It is an arithmetic number, because the mean of its divisors is an integer number (5355456750).

Almost surely, 2^21401424211 is an apocalyptic number.

21401424211 is a deficient number, since it is larger than the sum of its proper divisors (20402789).

21401424211 is a wasteful number, since it uses less digits than its factorization.

21401424211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20402788.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21401424211 its reverse (11242410412), we get a palindrome (32643834623).

The spelling of 21401424211 in words is "twenty-one billion, four hundred one million, four hundred twenty-four thousand, two hundred eleven".