21304023011 has 4 divisors (see below), whose sum is σ = 22425287400. Its totient is φ = 20182758624.

The previous prime is 21304022989. The next prime is 21304023017. The reversal of 21304023011 is 11032040312.

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

It is a cyclic number.

It is not a de Polignac number, because 21304023011 - 2⁶ = 21304022947 is a prime.

It is a super-2 number, since 2×21304023011² (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 (21304023017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560632166 + ... + 560632203.

It is an arithmetic number, because the mean of its divisors is an integer number (5606321850).

Almost surely, 2^21304023011 is an apocalyptic number.

21304023011 is a deficient number, since it is larger than the sum of its proper divisors (1121264389).

21304023011 is a wasteful number, since it uses less digits than its factorization.

21304023011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121264388.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21304023011 its reverse (11032040312), we get a palindrome (32336063323).

The spelling of 21304023011 in words is "twenty-one billion, three hundred four million, twenty-three thousand, eleven".