21041340011 has 4 divisors (see below), whose sum is σ = 22279065912. Its totient is φ = 19803614112.

The previous prime is 21041339981. The next prime is 21041340041. The reversal of 21041340011 is 11004314012.

It is a happy number.

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 (21041339981) and next prime (21041340041).

It is a cyclic number.

It is not a de Polignac number, because 21041340011 - 2¹⁰ = 21041338987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1237725883 = 21041340011 / (2 + 1 + 0 + 4 + 1 + 3 + 4 + 0 + 0 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041340041) 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, 618862925 + ... + 618862958.

It is an arithmetic number, because the mean of its divisors is an integer number (5569766478).

Almost surely, 2^21041340011 is an apocalyptic number.

21041340011 is a deficient number, since it is larger than the sum of its proper divisors (1237725901).

21041340011 is a wasteful number, since it uses less digits than its factorization.

21041340011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237725900.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21041340011 its reverse (11004314012), we get a palindrome (32045654023).

The spelling of 21041340011 in words is "twenty-one billion, forty-one million, three hundred forty thousand, eleven".