21043342011 has 8 divisors (see below), whose sum is σ = 28061020480. Its totient is φ = 14027279112.

The previous prime is 21043342009. The next prime is 21043342013. The reversal of 21043342011 is 11024334012.

It is an interprime number because it is at equal distance from previous prime (21043342009) and next prime (21043342013).

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

It is not a de Polignac number, because 21043342011 - 2¹ = 21043342009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043342013) 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, 373165 + ... + 425838.

It is an arithmetic number, because the mean of its divisors is an integer number (3507627560).

Almost surely, 2^21043342011 is an apocalyptic number.

21043342011 is a deficient number, since it is larger than the sum of its proper divisors (7017678469).

21043342011 is an equidigital number, since it uses as much as digits as its factorization.

21043342011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807785.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21043342011 its reverse (11024334012), we get a palindrome (32067676023).

The spelling of 21043342011 in words is "twenty-one billion, forty-three million, three hundred forty-two thousand, eleven".