21424331211 has 8 divisors (see below), whose sum is σ = 28571573760. Its totient is φ = 14279988072.

The previous prime is 21424331177. The next prime is 21424331213. The reversal of 21424331211 is 11213342412.

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

It is not a de Polignac number, because 21424331211 - 2⁶ = 21424331147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21424331213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707551 + ... + 737208.

It is an arithmetic number, because the mean of its divisors is an integer number (3571446720).

Almost surely, 2^21424331211 is an apocalyptic number.

21424331211 is a deficient number, since it is larger than the sum of its proper divisors (7147242549).

21424331211 is a wasteful number, since it uses less digits than its factorization.

21424331211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449705.

The product of its digits is 1152, while the sum is 24.

Adding to 21424331211 its reverse (11213342412), we get a palindrome (32637673623).

The spelling of 21424331211 in words is "twenty-one billion, four hundred twenty-four million, three hundred thirty-one thousand, two hundred eleven".