21044023011 has 48 divisors (see below), whose sum is σ = 33489456000. Its totient is φ = 12627861120.

The previous prime is 21044023003. The next prime is 21044023031. The reversal of 21044023011 is 11032044012.

21044023011 is a `hidden beast` number, since 210 + 440 + 2 + 3 + 0 + 11 = 666.

It is not a de Polignac number, because 21044023011 - 2³ = 21044023003 is a prime.

It is a super-2 number, since 2×21044023011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21044023001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5626380 + ... + 5630118.

It is an arithmetic number, because the mean of its divisors is an integer number (697697000).

Almost surely, 2^21044023011 is an apocalyptic number.

21044023011 is a deficient number, since it is larger than the sum of its proper divisors (12445432989).

21044023011 is a wasteful number, since it uses less digits than its factorization.

21044023011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304 (or 4301 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21044023011 its reverse (11032044012), we get a palindrome (32076067023).

The spelling of 21044023011 in words is "twenty-one billion, forty-four million, twenty-three thousand, eleven".