21131230011 has 16 divisors (see below), whose sum is σ = 29120437248. Its totient is φ = 13615898400.

The previous prime is 21131229997. The next prime is 21131230037. The reversal of 21131230011 is 11003213112.

It is a happy number.

It is not a de Polignac number, because 21131230011 - 2⁷ = 21131229883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21131230411) 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, 68425 + ... + 216666.

It is an arithmetic number, because the mean of its divisors is an integer number (1820027328).

Almost surely, 2^21131230011 is an apocalyptic number.

21131230011 is a deficient number, since it is larger than the sum of its proper divisors (7989207237).

21131230011 is a wasteful number, since it uses less digits than its factorization.

21131230011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285922.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21131230011 its reverse (11003213112), we get a palindrome (32134443123).

The spelling of 21131230011 in words is "twenty-one billion, one hundred thirty-one million, two hundred thirty thousand, eleven".