21420003311 has 8 divisors (see below), whose sum is σ = 24480912384. Its totient is φ = 18359321400.

The previous prime is 21420003271. The next prime is 21420003313. The reversal of 21420003311 is 11330002412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21420003311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420003311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420003313) 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, 272846 + ... + 342468.

It is an arithmetic number, because the mean of its divisors is an integer number (3060114048).

Almost surely, 2^21420003311 is an apocalyptic number.

21420003311 is a deficient number, since it is larger than the sum of its proper divisors (3060909073).

21420003311 is an equidigital number, since it uses as much as digits as its factorization.

21420003311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113581.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21420003311 its reverse (11330002412), we get a palindrome (32750005723).

The spelling of 21420003311 in words is "twenty-one billion, four hundred twenty million, three thousand, three hundred eleven".