21043402411 has 8 divisors (see below), whose sum is σ = 21379635200. Its totient is φ = 20707821288.

The previous prime is 21043402403. The next prime is 21043402433. The reversal of 21043402411 is 11420434012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21043402411 - 2³ = 21043402403 is a prime.

It is a super-2 number, since 2×21043402411² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043408411) 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, 97611 + ... + 227188.

It is an arithmetic number, because the mean of its divisors is an integer number (2672454400).

Almost surely, 2^21043402411 is an apocalyptic number.

21043402411 is a deficient number, since it is larger than the sum of its proper divisors (336232789).

21043402411 is an equidigital number, since it uses as much as digits as its factorization.

21043402411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325833.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21043402411 its reverse (11420434012), we get a palindrome (32463836423).

The spelling of 21043402411 in words is "twenty-one billion, forty-three million, four hundred two thousand, four hundred eleven".