21043423011 has 16 divisors (see below), whose sum is σ = 30580252416. Its totient is φ = 12793775136.

The previous prime is 21043422991. The next prime is 21043423073. The reversal of 21043423011 is 11032434012.

It is not a de Polignac number, because 21043423011 - 2¹⁴ = 21043406627 is a prime.

It is a super-2 number, since 2×21043423011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21043423081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3247215 + ... + 3253688.

It is an arithmetic number, because the mean of its divisors is an integer number (1911265776).

Almost surely, 2^21043423011 is an apocalyptic number.

21043423011 is a deficient number, since it is larger than the sum of its proper divisors (9536829405).

21043423011 is a wasteful number, since it uses less digits than its factorization.

21043423011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6501002.

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

Adding to 21043423011 its reverse (11032434012), we get a palindrome (32075857023).

The spelling of 21043423011 in words is "twenty-one billion, forty-three million, four hundred twenty-three thousand, eleven".