21421034311 has 4 divisors (see below), whose sum is σ = 21427234192. Its totient is φ = 21414834432.

The previous prime is 21421034293. The next prime is 21421034329. The reversal of 21421034311 is 11343012412.

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

It is an interprime number because it is at equal distance from previous prime (21421034293) and next prime (21421034329).

It is a cyclic number.

It is not a de Polignac number, because 21421034311 - 2⁵ = 21421034279 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 (21421034351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3094755 + ... + 3101668.

It is an arithmetic number, because the mean of its divisors is an integer number (5356808548).

Almost surely, 2^21421034311 is an apocalyptic number.

21421034311 is a deficient number, since it is larger than the sum of its proper divisors (6199881).

21421034311 is an equidigital number, since it uses as much as digits as its factorization.

21421034311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6199880.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21421034311 its reverse (11343012412), we get a palindrome (32764046723).

The spelling of 21421034311 in words is "twenty-one billion, four hundred twenty-one million, thirty-four thousand, three hundred eleven".